The Tee Shirt Sewing Pattern from Merchant & Mills. The T shirt is probably the worlds most popular garment, presented here as a smart, contemporary evolution of a wardrobe staple. Our Tee Shirt is a smart combination of a woven fabric with a stretch rib neck, a breast pocket and optional rolled up sleeves. This is a multi size paper pattern in an envelope, including sizes 36 to 46. All seam allowances are 1.5cm except for the neck which is 1cm, these are included and marked on the pattern.