Any of the ones in the "other" category. I personally don't like her standard outfits much at all.

Dangerous Beast...

I mean, Dive to Blue...

I mean, Personal Training...

Actually, I do like her normal Chaldea uniform and a lot of her casual clothes look good, not to mention her formal dresses.

Paladin and her Idol costume.

I do not like her design, generally speaking I don't like un-realistic armours such as bra-shaped breast armours. That is like asking for trouble in real fights, it is not protecting(actually it is concentrating every attack towards the heart) and not comfy, real female-friendly armours should be like the one Barghest is wearing. The only possible advantage of using the bra armour is to please some male audiences. "Oh look at her breasts, hehehe. Put them in a normal armour? Def No! We won't be able to admire her breasts anymore if they are covered by a boring plate."

but I like the fact that Galahad the virgin knight is very likely to be the one behind the design.

Her second swimsuit!!!

Just wanted to say Dannie, I grail Summer Melusine, just like you, hehe 😁

^^ Honestly I agree about the armor but at this point I'm so used to seeing stuff like it I've kinda given up on caring.

Although in terms of other characters iirc I once heard someone say it sorta makes sense on hephastion (I forgot how it's spelled) since iirc it was something about how men's armor from the time had like the abs and chest design it's possible had there been women's armour it'd possibly be similar or something like that

Yes, the armor is what I don't like too. It looks ridiculous.