The skirt in the previous photo is of wrap-round construction. Undoing a button and a buckle enables it to fall away. The tie-side and tie-up bikini confer the same advantage...
Bicycle Race and Fat-Bottomed Girls are both songs by Queen, 1978.
You can see a larger copy of this photo by following instructions appended to all my messages on the doll forum. See the doll forum link on my Links page.