Here is the slip I made to put under my dresses that are just a tad too short for comfort when you're doing anything other than standing straight up.
SUPER EASY! First you need a slip (grabbed one at the thrift store). Then some sort of lace or fabric. I wanted eyelet lace, and just bought the already ruffled, thick stuff from the fabric store. Now...sew them together =0).
I wear it with a lot of different dresses. It lengthens and adds a little extra cuteness to the outfit.
Now I just need some new shoes =0P.