I seem always to go back to comments I read from WIllam Ware Theiss, who was the costume designer on the original STAR TREK. NBC had all kinds of arcane rules, in terms of which parts of the female body could be uncovered (for instance, the top of the breast could be shown almost down to the nipple, but the underside of the breast was forbidden), so Theiss created sexy costumes by uncovering parts that were no normally considered risque, like the upper hip, or by making the costumes look like the ladies were about to fall out of them at any moment (which, apparently, they frequently did!)

In other words, by being CLEVER.

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JB, I just got a vivid image in my mind of my all-time fave TOS babe:  Andrea the Android, and her "barely there" costume.  Rowr!