I'm totally obsessed with this poplin Lux Onsie from Urban Outfitters! It's only $20 so it'd be a no-brainer but I don't like to buy certain kinds of items without trying them on. Also, I think that jumpers and onsies might be the kind of thing that only looks good on truly petite girls. Have you jumped on the romper look or do you think they should stay on pre-school aged fashionistas only?
