So I dont think all the girls have bathing suites - but i did just beat arcade on the hardest setting with lisa (didnt get anything) and i fought against TINA in her skimpy all American suite (not the CE one). So i guess Tina has one.
I know kasumi and ayane dont have any skimpy suites because when you collect all the costumes u get a tittle saying collected all of ayanes costumes, etc...
Also I need to say this, and im sorry if it bums anyone, but DOA has always had super polished level design, and some stages are! But some stages, look not so polished. Sanctuary for instance a lot of the textures on the rocks and floor look like they belong in DOA 3! :|
Gameplay is pretty decent - still much to learn and adjust too. Online is good but i have only played with people who have red bars so i cant really say...
Also if its true that you have to collect all the "tittles" before alpha is playable, than no one will have alpha for a long time. Some of these titles are like "play 1000 with tina, win 100 win with tina, etc"... so if she is playable it will take a long long time to unlock her!