March 2, 2010
It sounds super easy of course. And really it is. But it’s also super cool and a great way to get through the rest of winter time without spending some bucks on some new shirts. Even here in Texas we’re having an elongated long-sleeve season with temps a full 10-20 degrees below normal. Brrrrrrrr. We’re not used to this down here!
All you need to get started is a sewing machine and a couple of short sleeve tees.
Find two that match. Or don't. Whichever you prefer.
If you like cap sleeves, whack them off. Or leave them. Your call.
try to get a basic measurement of the distance of the seam that joins the body of the tee to the sleeve. then half that measurement , add 1/2" for seam allowance, and use that number to draw a line from the center of the tee that will be your long sleeves down to just under the armpit of the tee, then make a line that goes down to the bottom of the tee shirt and tapers in.
hard to see here, but i folded the top sleeve piece in half lengthwise in order to get a mirror image to complete the sleeve piece. trace and cut. the bottom hem of the shirt will now be your wrist hem. so you want the length that your sleeve tapers to at the bottom to equal the diameter that you would like the wrist of your sleeve to be, minus 1/2 in seam allowance on either side.
fold both sleeve pieces in half lenghwise, right side in, and stitch up the underarm seam. i used my serger here, but a zig zag stitch (for stretch) would also work.
fold your tee shirt inside out. stuff the sleeve of your teeshirt (the one that came attatched to it, not the one we're going to add) INSIDE the shirt, so that you are looking at the bodice of the tee shirt and can see the shoulder seam, but the sleeve is tucked inside. now you will take one of your new long sleeves, flip the underarm seam so that it is on the INSIDE of the sleeve, then stuff the whole thing inside the tee shirt where you have already stuffed the existing short sleeve, wrist side first. line up the underarm seam of your new sleeve with the underarm seam of your existing sleeve, then match the sleeves all the way around the diameter of the sleeve opening. zig zag new sleeve to existing sleeve.
when you are done stitching, your layers of sleeve and tee shirt should basically look like this. (keep in mind this tee shirt is INSIDE OUT).
do the same thing to the other sleeve, then turn it all right side out! voila.