I always have a few dozen really big oversized tee shirts hanging around that people give me, from concerts, from the hubby or that I find at the thrift stores. I finally found a sweet tutorial on here on how to turn them into shorts or gauchos.
I modified and altered it a bit, but here's my own version! I am making them for my friend who is 4 months pregnant and is finding her pants don't fit anymore! The soft stretchy waistband is her favorite! I stitched my pants w/ a rolled hem on my serger but you can flat serge it or just straight stitch them- what ever you prefer! Enjoy my photos:
Start with you big ol' tee shirt and lay it out flat.
Chop the sleeves and right down the center and your outter seams (below armpits).
Cut a straight line just below the collar.
Serge or stitch your inner crotch seams.
Open up your pieces and lay right sides together.
Serge or stitch your inseam.
Open up pant legs and sew inner and outter leg seams.
Turn right side to. Hang in there! You're almost done!!
Cut a band at 16" Tall (or what ever height you desire) I make my band 1 inch less than the shorts waist band so that it has some 'hug' to it. I also make mine bands around 16" so that they can be folded in half.
Voila! Your pants are done!