Cotton tail - someone new to naturism with tan lines i.e. tanned torso, white bum!
FKK - The original formal naturist movement - " Freikörperkultur " - Free Body Culture. You may notice "FKK" and an arrow chalked on a rock, post etc. directing you to a lesser known naturist beach.
Meerkat or Lurker -Someone who lurks in dunes and pops up to stare at other beach users. Just...why? Usually middle-aged males. Also Gawper.
Smooth - A smooth naturist removes body hair, especially pubic.
Textile (noun) - a person who wears clothing when nakedness is reasonable, e.g. on naturist beach.
Textile (adjective) - a place (usually beach) were nudity is not usually accepted.