The problem with many outfits or armor in BG3 is that they are too costumey. Too decorated. They don't look or feel like clothes these characters would actually live or travel in. Even starter gear like the Druid Leather Armor. People who live in the wilds don't wear costumes. They wear utilitarian outfits that show a little wear and tear. Nobles in Baldur's Gate might wear costumes and fashionable decorated outfits, but in BG3 everyone does.
Some designs, like the basic Leather Armor or some stuff the NPC's are wearing look more believable. Like the Breastplate Aradin is wearing.
Overall I'd say Larian's designs lack situational awareness and tend to be too overdone and too costumey.
