T-Shirt Mod: Boxy to Foxy

• Pin along the new side seams, and cut off the sleeves at the new armhole.
• Run the new side seams through the serger.

Lay out the old sleeve under the template t-shirt and mark the new underarm and armhole.

Serge the underarm, then cut the shoulder curve.

• Flip the sleeve right side out and set it inside the armhole of the shirt.
• Pin both sleeves into their armholes.

Serge the sleeve seams and you're all done!