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!


Free pattern download: Short Sleeve Shirt

It’s the beginning of a hot summer’s day here.  It is most definitely short sleeve weather at last and we are ready for it!  I’ve added a free pattern download to accompany the Fairfield Button-up so that you can sew it as a short sleeve shirt.


I designed the short sleeve to be 4″ long at the seam.  In my opinion, this length is the happy medium between trendy super short styles that expose the bicep and the more traditional short sleeve that extends almost to the elbow.  Our short sleeve will create a look similar to this inspiration from Canadian retailer Frank & Oak:

Short sleeve shirt sewing pattern for men

I added a deep 1″ hem which is shaped along the seam to accommodate the taper of the sleeve.

The construction of this short sleeve is very simple (the exact same as the long sleeve but without the added details of a sleeve placket or cuff!) so I wrote construction notes directly on the pattern piece.  There is no instruction booklet to print with this download so it is a small file with only four pieces of paper needed.


The short sleeve pattern piece is available for the “Average Figures” sizes – XS-XXL right now but I will be drafting a short sleeve to pair with the “Larger Figures” pattern soon.  We are away for a few days of camping and wedding festivities (Matt’s brother is getting married!) and then we are moving in to our new house when we get back.  I will get to work on the Larger Figures short sleeve pattern as soon as we recover from all of that.  In the meantime, I thought many of you would want to get started on the XS-XXL short sleeve as soon as it was ready for you:

Download your free short sleeve pattern and wear your short sleeve Fairfield Button-up out in the summer sun!

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Free collar download!

The first of our free downloads to accompany the Fairfield Button-up Shirt pattern is available in our shop today!

The Alternate Collars add on will allow you to add a band or widespread collar with collar stays to the Fairfield Button-up.

When you download this collar pack from our website you will receive the pattern pieces to print at home and the instructions necessary to add the collars to the Fairfield Shirt.

The pattern pieces and instructions allow you to create:

Sartorialist - band collar.jpg

Image Credit: The Sartorialist, July 18th 2013. Photo by Garance Dore.

A Band Collar

This is an old fashioned style that stems from when it was common to wear detachable collars (and sometimes simply leave the collar off).  In the last couple of years the band collar (or Mao collar, or Grandad collar) has had a resurgance in popularity.  It is essentially a collar stand with no collar attached.  It is simple to construct and no additional pattern pieces are necessary.  Instructions are included within the download to explain how to use your collar stand pattern pieces to make this style.

Band Collar inspiration.jpg

Source: 1. Articles of Style 2.Still Winter 3. Burton Menswear

I will be sewing a band collar shirt using our buffalo check shirting for my dad during our sew-along!


Image Credit: Eton Shirts – on Cutaway and Spread Collars

A Wide Spread Collar

This collar style is a classic style that most men have in their wardrobes.  It is flattering with wider ties and does a great job adding the illusion of width to narrow faces.  The download includes the pattern pieces and instructions for a wide spread collar complete with collar stays.  You can skip the collar stays if you are going for a less formal look!

Spread Collar Inspiration

Source: 1. Proper Cloth 2. D’Marge 3. The Suits of James Bond

I will be making a wide spread collar during the sew-along to add to the shirt Matt is wearing as best man at his brother’s wedding this summer.

Head here to download the free collar variations!

Our sew-along begins this Monday, May 16th.  The first post will include the sew-along schedule and all of the information you need to gather fabric and notions before we begin to measure, cut and sew!


Merry Christmas – Free Holiday Card Download


Merry Christmas everyone!  As a small holiday gesture from Thread Theory, we’ve added a new free download to our shop – printable postcards!  Rather than send out a Christmas card full of thank yous and good wishes to every single one of you, Sonia (our graphic designer) and I decided to create some postcards so that you can print them out at home and send them to loved ones yourself!


To download them, head here, add them to your cart and proceed to your checkout as if you were making a purchase.  After entering your contact info you will be given a link to download your card and an email will be sent to you with the same link for future use.

Print off your postcard using the heaviest cardstock you can find, fancy colored paper or, even better, nice glossy photo paper.  The image is black and white so that you don’t need a color printer to use these cards.  You can print it double sided to have writing and address divisions on the back if you like:

I hope that these cards will accompany your handmade and creative gifts this year!  They will be available in the ‘Gift’ section of our site permanently so you can use them in the future too.


Have a Merry Christmas and/or happy holidays!  See you in the New Year!