Generic tag for any One-Piece Swimsuit design that features a Sailor Collar.
Note that the sailor collar should be attached to the swimsuit itself; don't use this tag if there is a Serafuku shirt over the swimsuit. For instance in post #482820, the middle character has a proper sailor one-piece, while the other two don't. Use the Serafuku and Swimsuit Under Clothes tags instead.
For the Idolmaster costume, see Sailor Swimsuit (Idolmaster).