Reply #9: The later ones were no picnic either

[pokerfan]

Jeri Ryan's catsuit on Voyager used to make her pass out.

Within the show, the rationale was given that the catsuit had been designed by the Doctor with certain properties that would help her maintain her human skin once her Borg exoplating had been removed; the further explanation was that Seven would feel more comfortable wearing clothing which mimicked that exoplating. http://en.wikipedia.org/wiki/Seven_of_Nine#Attire

No explanation was given for the six inch high heels. :)