Thread Theory

Welcome to the new era of menswear sewing. Go ahead and create something exceptional!

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Now available: More of our patterns in French!


The Belvedere Waistcoat, Fairfield Button-up and Lazo Trousers instruction booklets are now available in both English and French!  We’ve also created a French instruction booklet for our FREE pattern, the Arrowsmith Undershirt.


Andrea’s inspiring print-mixing made the Arrowsmith Undershirt into a great use of small fabric scraps! @jollygiraffe1

To access the French instruction booklets, follow the link at the bottom of each product page to instantly download the free file (follow the links above).  This way, even if you’ve already purchased our pattern along with the English instruction booklet, you can now quickly access the instructions in your preferred language.

Happy sewing!


New today! French Instruction Booklets

French Instructions 2

I have a big announcement about another free addition to the Thread Theory store was just launched today: French translations of all our instruction booklets!

We’ve worked with a French speaking sewer and our French speaking graphic designer to translate our PDF booklets so that people who have bought our patterns in the past, whether it be from stockists or from our website, will have access to the instruction booklet, complete with translated diagrams and metric measurements!

Now here is the [small] problem: We’re still working on perfecting these and need your help.  Neither Matt or I speak French so we hope that any of you French sewists who use these translated booklets will send us an email ( if you notice incomplete translations or measurements that you would prefer to be in metric.  We’ll continue to perfect the booklets based on your suggestions!  Some of the content still in English is in red text – these things are the priority items that need to be translated.  Also, some of our measurement charts are not yet in metric because I’m hoping that French sewers will send us their opinion about how they would like these to be formatted: For instance, do you prefer if BOTH metric and imperial measurements are included?  Or do you like if only metric measurements are given?  Do you seamlessly transition between both when it comes to measuring seam allowances or determining fabric amounts (I know I do…it drives Matt crazy!)?

Thank you for your opinions and assistance!  I look forward to hearing from you.


Merchant and Mills on Instagram

Next up on Thread Theory updates: We recently joined Instagram!  I’m excited to use it to give you behind-the-scenes glimpses of the Thread Theory studio and information about developments before they are announced on the blog or website.  And based on what our latest teaser featured, you can probably predict what I’ll be busy with today: Uploading Merchant & Mills products to our store!  Stay tuned for an in-depth post about this amazing and inspiring company as well as the beautiful and very functional tools that we will be carrying in our store.

Have a great weekend!