There's... really no reason clothes are required here.
From a societal standpoint, they really have nothing they particularly need to cover
From a scientific standpoint, they wouldn't need it
Humans developed clothes for the sake of both modesty and homeostatic equilibrium. If both are already covered in this scenario, it technically wouldn't mecessitate wearing clothes. Therefore, it's not really nudity in the NSFW sense as much as it is nudity in a fashion/design/aesthetic sense.
This is something that's been discussed at length by furries and non-furries alike. Otherwise, take, for example, some pokémon that have a furry-esque aesthetic (Zeraora, Lucario, Zoroark, etc.) They're completely SFW, despite having no clothes.
I understand and appreciate your concern, though, and I assure you I've taken this line of reasoning into consideration.