Here's the t-shirt I started with. It's a men's Hanes brand from Walmart that came in a 3-pack and cost about $8.
Step 1. Try on your shirt, inside out, and mark with a pin how much you want your sleeves taken in. Mark at the edge of the sleeve and at the armpit.
Step 2. Remove shirt and add a few more pins, if desired. Make sure the original sleeve seams are lined up and pinned in place.
Starting at the edge of the sleeve, sew with a straight stitch along the sleeve toward the armpit, making a pretty sharp curve about half an inch from the sleeve seams. Now as you sew down toward the bottom of the shirt, angle your seam toward the edge of the shirt, gradually sewing off of the shirt, as seen below.
Repeat on the other sleeve.
I bought my shirt to fit around the middle, so taking in the sides wasn't necessary. If you want to take in the sides, don't angle your seam, but continue that seam straight down the side of the shirt, all the way to the bottom.
Cut out the extra fabric and zigzag or serge the raw edge.
And voila! Cute new half sleeve t-shirt. For less than $3.
As always, comment or email me with questions! Happy Sewing!
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Oh, by the way, I'm doing a little radio interview tomorrow on BYU Radio's "Afternoons With Matt Townsend", talking about good fashion on a budget, and how dressing well improves your self image!
If you're interested in listening (and hearing my deep voice -- I know you are), it's on Sirius XM Radio Channel 143 or byuradio.org from 3-4pm MST tomorrow!