I don't know why people can't look past a cat suit and nice figure to the character. T'Pol and 7 were very well developed characters with great personality growth arcs that carried on over 4 seasons each. They were not static like a lot of characters in Trek tend to be. Yes they have large breasts.. because some women DO have large breasts and nice figures. Does this make them about nothing more than sex?
What bothers me is when the characters dress in a sexually provocative manner when it is inconsistent with the rest of their personality -- or, in the case of T'Pol's early catsuits, with the practices of her culture.
The idea that Seven would want to dress in a skintight catsuit that is literally designed to lift and separate each individual breast is just absurd. Seven is a character who hides feelings of sexuality because she considers them a form of emotional vulnerability; she wouldn't wear a slinky, cleavage-y dress to a fancy event, for instance, and she wouldn't plausibly wear a skintight catsuit.
Have you seen how the Borg dress? They are tightly covered all over by their "armor" if you can call it that. They are held in by it. I think 7 feels safer completely contained by the suit. It's like a swaddling cloth. To wear something loose that flaps around.. that's inefficient and indicates a comfort with oneself that 7 doesn't have. She doesn't see it as kinky and cleavagy, you do.