Great tut and thanks for sharing!
So, tonight I went ahead and took an old nightgown and tried the same technique to preserve the image on the front. Only.... when I sewed all of the seams up, I realized I'd made a HUGE error... I can't even get the pants on past my thighs, the waist is that tiny. >.<
Unless.. you have any ideas or tips for what I can do to increase the waist/hip size so I can actually get the pants on?
I know this is after the fact, but was the nightgown made from a stretch knit? If not, maybe the fabric didn't have enough give to it? Maybe try making the waistband from a different t-shirt that has some stretch to it. Good luck.
It's 100% cotton, but it's not really stretchy.. I've decided to just cut out the image, add strips along the legs, and replace the image with patches or pockets or something.