Grab a sleeved t-shirt that needs some extra love, and flip inside out. I have about 10 of these "boyfriend tees," the ones that are V-neck and have a little pocket. Cute! But I rarely wear most of them anymore because they're all the same. Here's a quick & easy way I revamped one. You'll need scissors, matching thread, elastic & a t-shirt (probably all things you have on hand, so this project is very cheap or possibly free).
Starting at the hem where the shoulder meets the sleeve, stretch a piece of thin elastic down the length of the sleeve & cut. Here's the length mine ended up:
Pin to the hem where sleeve meets shoulder and sew to hold it in place.
With the presser foot down, hold the shirt and stretch the elastic. Continue to slowly sew as you guide the shirt along. Backstitch a few times & trim the threads.
Repeat on the other sleeve, and YOU'RE DONE! So easy & it adds some jazz to an otherwise un-loved tee. What a CINCH (pardon the pun, I just had to!).