This is my first post! I've been looking around craftster for a long time, though.
Jumpin right into this, I've seen a lot of tutorials on how to make a giant tshirt into pants; well, I don't like cutting through images and having half the picture on one side, half on the other. Sooo, I thought about it for about twenty seconds, and figured this would prolly work. and it did. I feel clever.
Start out with a big old tshirt:

I'm using this blue shirt as lining for a white pair of pants I'm making.
Cut off the sleeves:

Cut off collar:

Now. Instead of cutting straight up the middle, cut up the SIDES.

(sorry for the bad picture)
Now you have the front and the back of the shirt seperate.
Take the front, fold in half WRONG sides OUT, and sew up the open side until you get to the sleeve, which will be your crotch.

That's both my legs, one is inside out. The blue shirt is a little short, but that's okay, I only needed it because I didn't want people seeing my panties.
Pin up the crotch and sew:


Make a waist band and sew to pants:

I made my waist band twice as tall in the back than the front.
Now the image on your shirt isn't cut in half, it wraps around your leg!

It says live united, my dad gave me a ton of shirts and a few pairs of pants that he didn't want. I hope the pictures aren't too big.
I hope you found this tutorial helpful! I've seen WAY too many people saying 'Oh I made these awesome pants, but I miss that beautiful [tree, owl, cat, ect] that was on the shirt'
Anyways, I made another pair out of a button up my dad attempted to throw away:


By the way, I handsew EVERYTHING I make. So if you're thinkin the seams don't look to sweet, that's why.