This one, from Emmy Design, comes in different colors. But I like it in light pink. It doubles as a swimsuit, has sewn in bra padding, a skirt-like detail at the front, and is made of bengaline - which is true to the swimsuit materials of the 40s.
Here is one with a cat in lace on it! Perfect for crazy cat lady-picnics! It comes from ModCloth.
Another one from ModCloth, the so called Romance Columnist Romper.
This is actually a bathing suit. But together with it's removable faux sarong skirt, I think it works very well as a romper too! It also has a built in bra. You find it at Revamp Vintage.
Another bathing suit that fits equally well as a romper. Also from Revamp Vintage. It has a boned bodice and a removable skirt.
Now I feel like having a romper party! Cocktails for everyone!!!