Ayane
The see-through skirt means her panties are still showing, which means she's wearing less and showing more thanks to the toplessness. Also, she has a FUCKING TOWEL.
Tina
No more skirt, and her top shows more. Not to mention this costume can malfunction and destroy other peoples bikinis, leaving them literally naked.
Kasumi
One of her outfits is a school swimsuit, too. Neither of them expose as much skin as the above. And don't forget that it also has a see-through skirt, and is a copy paste. It's like they didn't even consider her character.
Lei-Fang
The DOA1 one is a simple bikini, but the DOA5 one could be substituted for censor strips with the suspenders and
very short shorts.
I have now wrapped up the original DOA1 cast. Scary, huh?
Helena
DOA2 Helena was a mature woman who was very adult-feminine. DOA5 Helena's just a slut who'll wear anything, including Christmas wrapping, aka the second worst theme of DLC.
And that was the only woman who got added to DOA2. Are you beginning to see my point?
HItomi
The difference is obvious. Note she got a personality downgrade as well, being turned into a ditz who will dance topless outside of a window instead of a serious karate expert.
Christie
What should scare you most is that this outfit was in Vanilla.
La Mariposa
You can really see the deterioration in her development, going from luchadore to scientist to footnote.
Kokoro
If the difference is not made clear just by this one comparison, then you're a lost cause.