>>2638094you wrote a generic comment not specifying if you meant the lewd fanart or the canon manga. so i'll talk about his official versions here are the pre time skip ones.
https://onepiece.fandom.com/wiki/Nami/Gallery#Main_Series_.28Pre-Timeskip.29 as you can see he wears almost always (there are exceptions like logue town's red dress or alabasta's 4th outifit) a generic t-shirt and a skirt. the hairstyles are various. but he has various post ts ones too. (i don't consider bikinis) in post ts she wears less skirts this can be a "bad" thing since her main outfit is jeans. but she wears more dresses those of Wci/zou/and wano are examples.
the physical appearance is as Oda originally thought.
(from sbs volume 6)
Sanji: Shitty guy! I ain't "weird"!! It's "love", I'm a "cook in love"!! Ah well, thanks for calling me. Just leave this stuff to me. Nami-san is so cute. And her style is right on. Now, let's take a look... B 86! W 57! H 86! No doubt about it!! She's so cuuuuute. Damn, she's a thief though. But I still love her!!
I don't think nami pre time skip respects these characteristics.
Of course there is nothing wrong with preferring Nami pre-ts.