Skin suit
From Tardis Wiki, the free Doctor Who reference
Skin suits were disguises made of the skin of an individual.
The suits were used by several species. Among them were the Raxacoricofallapatorians and the Foamasis. If the skin was smaller than the individual using it, there were different techniques to use. The Raxacoricofallapatorians used compression field collars. (TV: Aliens of London/World War Three) In the The Lost Boy, Raxacoricofallapatorians could use more advanced technology which elimanated the use of the Gas exchange and can use a slimmer body. The Foamasis were gifted with a biology that gave them hollow bones with double joints every few centimetres, a high liquid content, small organs and a retractable tail. (PROSE: Placebo Effect)
