I am trying to stock up on some fall clothes for Hannah here and there, and saw a toddler version of this (lavendar batgirl) shirt at old navy a few weeks ago. The toddler version is a long sleeved, mock layer shirt (so it's identical, except for the "underneath" layer of the ls is white.)
Anyways, they have sold out online, and aren't in stock at my store, but if you come across it (and/or a pink superwoman version they have that just has a large pink "S" symbol on the front, same style as the ls batgirl) in a 4t, I would be forever thankful if you'd snag them for us. (I'll obviously paypal for the shirts and cost of shipping)