So since I had my son first and only have one boy after he out grows his clothes- that's it. It feels kind of wasteful since the girl's clothes get worn by 2 people... so a couple of cute shirts I held back to see what I could do "girl" them up.
First I sewed an extra piece of knit onto the bottom (will use this to attach the ruffles to):
Next I cut out 3 strips of different colors. If you are using other t-shirts to do these strips (I used adult tee's) I cut 2 pieces off the bottom of the shirts and then cut each one at one seam and attached them to make them into one big loop. I don't have a serger so I just zig-zaged around the one side and then gathered the other side of all three loops.
Next you just sew the gathered edge onto the extra fabric at the bottom and it is a girls dress!
And as comfortable to play in as a t-shirt!