The first time we see Lara she is playing around on a jet ski wearing this.
It reminds me a lot of the famous bikini from James Bond's first outing, Dr. No, replicated by Halle Berry in Die Another Day.
The top isn't too skimpy, it looks a lot like a sports bra.
Her bikini briefs have a utility belt and aren't too high cut on the leg.
On her right arm she wears a knife and on her left wrist she wears her wide-strapped watch.