i've used this tutorial a few times before...http://www.cutoutandkeep.net/projects/oversized_t_shirt_to_comfy_yoga_pants
my niece thinks its pretty cool so i made her a pair for her b-day (on this pair i cut up the side of the shirt instead of the middle like the tutorial). i got the shirt at the thrift store for 50 cents. she loves pink and volleyball so i thought it was perfect. i just hope they're not too low rise for her (she's going to be 12). the pairs that i've made for myself have been too low in the back. eh, she can just wear them for pj's. i also sewed in my "handmade by trevin's momma" label. well, here they are...not anything too special but super comfortable.
showing off my label (i can never tie a straight bow, lol)