Sailor fetish
From wipipedia.org

A sailor fetish is a sexual fetish in which either a man or a woman enjoys dressing in a sailor's uniform (or clothing imitating such a uniform), or someone derives sexual pleasure from viewing men or women dressed in this manner.
This is a popular fetish among gay men, possibly because it is often thought that many male sailors are gay, or because they are muscular males in relatively close-fitting clothes that may show a male bulge.
For the skirted sailor-suit, see School uniform fetish.