Eeek!  Today is the big day!  We have been working away in secret for a couple weeks now in order to prepare for today's post...and here it is: A You-Tube video on how to sew the fly! We hope that you like it and find it more helpful than photos would be.  This is our first time (ever!) making a video so it is far from being professional quality (we have already learned so much that we want to do differently on the next one).  And, since I'm really shy, I just have to say - please excuse my nervous awkwardness in front of the was terrifying! If anyone would prefer a photo tutorial to the video, let us know in the comments and we will take stills from the video and turn them into a traditional photo post on how to sew the fly. Good luck with your sewing today!  Just pause the video whenever you reach a tricky point and re-watch.  It goes a little fast compared to the real life sewing process as we cut out anything repetitive but we were careful to include a video for every sewing step so you can follow along using the written instructions. [youtube=]



Maggie said:

I know this is many years post sew-along but am i the only one having trouble binding the zipper area??? it’s such a sharp corner… Does it need multiple pieces of binding? The curve just makes it kind of bulky and weird…


ThreadTheory said:

Yes, it can be a tricky little corner to do! I manage it with just one piece of binding but tend to soften the corner while I sew on the binding (I don’t have the binding fully aligned with the fabric at the corner). I then clip in to the binding to allow me to press the fly facings in the following steps. Since I end up clipping anyways, your fly would be just as nice if you bind the fly facing and then bind the seat seam separately (with two pieces of binding). Then you wouldn’t need to clip at the sharp corner :).


sewitrockit said:

thank you wonderful news!!

Steph from NZ

Steph from NZ said:

Thank you for making the instructional video! Your sewalong posts have made this project achievable for me and I have been nervous about the zipper :)


ThreadTheory said:

I’m glad the video has helped you! It isn’t the most professional but it gets the job done :P


Maree said:

Well I’m sewing up Jebediah, doing great guns until I get to the fly video which is blocked to Australia on copyright grounds. WAH! I know that I was previously able to watch this because I used it over a year ago to sew a pair for my hubby. Please please change the permissions on this video so that I am able to watch it. :(


Petra said:

Hi, I bought the PDF pattern and would like to make the pants for my bf, but just like Maree, I am also not able to watch the video (sewing the fly) in Hungary. Could you please solve this?

Thank You.


ThreadTheory said:

Hi Maree, Thanks for letting me know! It turns out that the song we had playing throughout the video has caused the video to be blocked in a couple hundred countries! I’ve temporarily removed the song but this has caused the audio to no longer match the video. I’ve left it posted like this for now so hopefully you will be able to view it. Matt is fixing the audio this afternoon (I hope) so we will have a far better version of the video/audio up on Youtube very soon. I hope that you are able to see the original video in the meantime so that you can keep flying along through the sewing process :).


ThreadTheory said:

Hi Petra, Thanks for letting me know that you aren’t able to view the video as well! As I’ve commented to Maree, it turns out that the song we had playing throughout the video has caused the video to be blocked in a couple hundred countries! I’ve temporarily removed the song but this has caused the audio to no longer match the video. I’ve left it posted like this for now so hopefully you will be able to view it. Matt is fixing the audio this afternoon (I hope) so we will have a far better version of the video/audio up on Youtube very soon. I hope your pants turn out wonderfully!


ThreadTheory said:

Thanks so much for taking the time to tell us you enjoyed our video! I hope we can continue to make more videos in the future – they are a lot of work and I usually prefer picture posts as well…but sometimes with small and complicated steps, there simply isn’t a better way to demonstrate the sewing process than video!


oanh said:

Morgan and Matt!
I just wanted to write how much I appreciate this excellent sewalong and video for the fly zipper. I generally don’t like videos (just a personal preference) but this is great and I have smoothly made the best fly zipper following your instructions (even if I say so myself).


ThreadTheory said:

Thank you so much for taking the time to tell us! We’re still a little bashful about it since it was our first video and it was a HUGE amount of work since video editing and speaking in front of a camera is so new to us…hence no new videos in the last year despite grand plans lol. But if it helps people make painless fly fronts then it has served it’s purpose wonderfully! I hope the rest of your pants turn out just as nice as you zipper did!

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How to Accumulate Best Partner Points | Unique Schmuck said:

[…] […]

At least I enjoyed sewing them… | the barricades of heaven

At least I enjoyed sewing them… | the barricades of heaven said:

[…] it’s the same difference), was the exact opposite, brilliantly clear, photos for each step, a video(!!!) for sewing the fly.  Can’t fault it.  So I followed that instead.  The only point I had issues with was the […]

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Navy Jedediah pants | reiny days and mondays said:

[…] that, construction turned out fairly easy. I LOVE that they did a video to help with inserting the fly. Believe it or not, this is my first pair of pants with a fly… all of the pants I have made […]

Reina Waterman

Reina Waterman said:

Just want to chime and add my thanks for the video! It really helped me out sewing my first ever zipper fly.


LSV said:

Wonderful – thank you for your hard work putting this together, it was really helpful!


ThreadTheory said:

No problem! It is worth all the work every time someone finds it has been helpful to them!


Bec said:

Morgan!! (And Matt) THANKYOU! I have just made up the fly on some Jed pants (Fathers day is coming up in Aus) and that was by FAR the best fly-insertion I’ve ever done! I usually fumble through not actually knowing what I’m doing but this video made it so simple to understand. I usually prefer picture posts, but this was the perfect step for a video. Just wanted to pop by & say thanks!

Completed: Jedediah Pants | Elena knits

Completed: Jedediah Pants | Elena knits said:

[…] to my first hand-made pants, the zipper here went like a bliss thanks to the wonderful video tutorial Morgan made. And those of you who are afraid of sewing fly zippers should go there and bookmark it. […]

Jeremy Scott

Jeremy Scott said:

Where did you get the zipper placement marker? Its not on the pattern – I think I have missed something!


ThreadTheory said:

Hi Jeremy,
Thanks for pointing out that it’s missing, I can’t believe that this is the first we’ve heard of it! The latest upload of the Jedediah Pants pattern seems to be missing the zipper placement mark so we are adding it back in right now and will email you a revised copy of the pattern (along with the page number that you will need to print so that you don’t have to reprint the whole pattern!) as soon as it is ready.

Anyone else who would like a revised copy of the pattern with the zipper placement mark added onto the Pants Front pattern piece is welcome to email us to request their copy. Drop a line to Sorry about this error!



Celeste said:

Love the video! At first I thought I wouldn’t be able to follow along but I was actually able to follow along better with the video than with just pictures. Also, what sewing machine are you using?


ThreadTheory said:

I’m glad you like our video! It was a LOT of work to make so we are thrilled any time someone mentions that they used it! My sewing machine is a “Reliable” industrial machine. It is lovely to sew with and lives up to its (slightly cheesy) name :).


ThreadTheory said:

Hi Elena,
I’m glad you liked the video!
In response to your question about the flat-felled seat seam, here is my experience: I really wanted to include one in the Jedediah Pants instructions and attempted to make up one of the samples in this manner (the greenish brown pants that were worn at my school fashion show). Since I decided to use the method where the fly is attached AFTER the seat seam has been sewn and after the pants front and back have been assembled (I like this method because it warms you up gradually to sewing the fly), I found the only way to do a flat fell seam is if the seam is completely clipped at the base of the fly. This makes it so that the seat seam can be sewn from the outside and the fly can be folded on the inside. This results in a slit in the finished pants that can be covered up with the zipper shield, the fly facing and bar tacking. Despite this approach working, I didn’t want sewers to have to cut into their pants in this way because it is so easy to cut too far and it is pretty scary! So I thought that the faux flat-fell seam is very strong, looks very similar and is much easier.

If you want to sew a flat fell seam, it is much easier to do this if you assemble the pants using the other common method – instead of assembling either side and then sewing the crotch, you assemble the front (including the fly and the front crotch section which you can faux flat fell) and the back (including the crotch seam which at this point is really easy to flat fell) and then sew the two inseams all at once. Peter Lappin (Male Pattern Boldness) has done this method in his pants sew-along and he does a really good job of explaining his seam choices:

Happy sewing :)


ThreadTheory said:

We’re thrilled that you liked it :) Matt had a lot of fun trying to figure out the most effective angle for each shot.


Kaira said:

Thanks for that! The video was really helpful and clear – I’ve always struggled with fly fronts and have bookmarked this so I can go back over it for other projects too :)


sewingpetal said:

Wow! The tutorial was great! I just propped my ipad up next to my sewing machine & stopped & started the tutorial as needed while inserting the fly. Thank you so much it is super informative and I loved the back ground music!


ThreadTheory said:

I’m so glad it was helpful and that you could follow it so easily while actually sewing! Thanks for the comment!

Elena Knits

Elena Knits said:

Are there any special instructions if we want to make a flat-felled seat-seam? I’m not sure how to do it, since the seam allowance goes outwards in this kind of seam, and I need it to go inwards for the fly. Thank you for this wonderful video!


Andrea said:

Great video. Informative and fun to watch because of the variation of scenes, angles and music. I thought the written instructions for the Jedediah fly were clear, but the video is helpful to know exactly how to fold, press and stitch everything. :)

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