Is your Smart Doll a playful little thing? If so then how about this "Play Suit" for your girl - also known as "Romper" - I decided to choose the name Romper for this item because "Play Suit" [プレイスーツ] in Japanese means something else apparently - something of the hanky panky variety...
Anyway, this one piece is really cute - perfect for a sunny day out or lazing around at home. Do note that you need to take the head, arms and bust off before you can put this on - check the photos to see how. Fits S - L bust.