New HUGE size range!

Summer Sewing Plans?

Meet the Bamberton Shorts Digital Sewing Pattern

Welcome to the new era of sewing

Go ahead and create
something exceptional

A satisfying sew and long-lasting garment

Create the
Woodhaven Apron

An instantly downloadable PDF sewing project

The menswear and workwear sewing projects you've been looking for.

As sewers and workwear enthusiasts, we want to work with quality designs, tools and materials that are specifically suited to our rugged sewing projects.

Our curated workwear, menswear and androgynous fashion sewing patterns, along with the corresponding tools and notions, make this possible! 

We're glad to meet you!

A small but mighty team

Morgan and Adrianna, along with a small crew of talented pattern making contractors, form the Thread Theory team. We both specialized in menswear during post-secondary fashion programs, we both have a passion for detailed and high quality tailoring practices, and we both love to sew!

From the people
From the people
This pattern is AMAZING and I cannot recommend it enough. The instructions are the best I've come across so far and although it was slow going, it was totally worth it.
— Natalia (bake_love_sew)
From the people
The instruction is just as brilliant as the #fairfieldbuttonup. I managed my first zip fly!!!! And on this rare occasion, the inside looks as presentable as the outside with the bias binding to finish off the raw edges.
— Charmaine (
From the people
My fourth version of the Finlayson jumper from Thread Theory patterns. A very easy pattern and I love the results.
— Els (elznl)