I have definitely purchased children's clothing for myself in the past. It's much easier when you are in a department store and just go to the children's section--you can then carry it into the women's section to try on with some women's clothing and no one looks twice. Going into an actual childrens-only store, like Gap Kids or Children's Place, can be more embarrassing, because I have had adult give me nasty looks, since I don't have a child with me and it's obvious I'm shopping for myself. I have only done this a few times--once when I was shopping for a skirt for a Halloween costume and couldn't find anything in any adult store in the mall, then walked by Children's Place and saw exactly what I wanted in the window, and another time when I was shopping for flowy beach cover-up skirts. At Children's Place, the skirts were just $10, and I didn't want to spend more than that on something that was going to be covered in sand and surf.
I don't see anything wrong with it. The largest children's sizes today are actually quite large, and I'm a small person.
As for the Stella collection, I had no idea she did something for Gap Kids. I was sad to see there was just one pair of non-sneaker shoes in the collection. I don't buy leather and actually own a lot of Stella shoes. But the Gap stuff isn't necessarily a deal anyway--the other day I bought a $600 pair of Stella shoes for $60 on Yoox, which is cheaper than some of that Gap stuff!
