I doubt that it matters too much that Tina, Lisa and Christie are the only one with the super skimpy suits at this stage. We're bound to get a plethora of swimsuits as DLC in the not-too-distant future. Even if they didn't market DOA5 to be out and out TnA in the run up to release (and yes...they did back-pedal a LOT), it's pretty much the only thing they'll have to fall back on in the future, in order to fire interest in the game back up, once the new release hype has died down.
I mean, sure...the DOA community will continue to play for a long, long time, but the chance of new adopters 6 months down the line is probably pretty slim. If they overlook it now, there isn't much chance of them reconsidering next year. Once the hype has died down, the only thing that will make people look again is either a major price drop, or a hot girl wearing next to nothing. Sad, but true. At least if the bikinis lure people in, there's a good chance of a lot more people discovering what is, beneath all the jiggling, a very strong and deep fighting game.