Turtleneck Swimsuit

This character wears a swimsuit with a turtleneck.

A polo neck, roll-neck(UK) or turtleneck (US) or skivvy (Australia) swimsuit is a garment with a close-fitting, round, and high collar that folds over and covers the neck. other than that, this is a regular swimsuit. Note that a turtleneck swimsuit can be a one piece or a bikini.