Are you really…. not supposed to…. describe what your characters are wearing….
I think there’s a great deal of misinformation on this topic.
I believe it’s fine to describe what your characters are wearing. However, like all things, it should serve some kind of purpose.
For instance, describing winter clothes helps impart to the reader a sense of how cold it is. Describing summer clothes helps explain how warm it is.
Describing an outfit before a social event gives a window onto the character’s sense of fashion, or explains their reverence (or lack) for the event; for example a character can wear a black suit to a funeral, or watch from a distance while wearing a t-shirt and jeans. These impart a different attitude.
An outfit may be described purely to give a little more interest to a character; to give the reader a bit more insight into who they are, through the way they present themselves. It may have no greater significance to the wider story but this is still a reason to do it.
So the “purpose” doesn’t need to be super-vital to the story. It can be just because “describing this to the reader helps them appreciate the character or scene”, but that’s still a purpose.
I like that last comment because I think it can apply to a lot of things in storytelling! Anything that shows some element of your character has a purpose to the story even if it doesn’t exactly advance the plot.