here's my usual checklist for making up a character's clothing:
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their environment!!
- This means their location/weather, their geographical area, and how active/how much they need to move! If they're cold, they need warmer clothes. if they're an athlete or assassin of sorts, they're going to need moveable clothes.
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what they like
- The OC's own design ideas are big! my favorite OCs wear skater-style clothes, gymbro fashion, and go for grunge. pick the style that the OC would pick if they were a real person. This also applies to color schemes
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the setting
- is it fantasy, post-apocalyptic, historical, modern, sci-fi, etc? Based on what the setting is like, this heavily alters what the character is going to wear. if it's a Tolkien-esque fantasy world, your MC isn't going to be wearing sneakers. If it's a 2001 high school drama, your MC isn't going to be wearing a Victorian dress. Y'know? Just stuff like this.
After I put all these into consideration, then I usually craft the image in my mind based on my own clothing choices (or my friends/family's sense of style), find a "style icon" in another piece to base fashion off of, or scroll through Pinterest to find a good idea.
A lot of my characters have their "main clothes", which is one outfit that I'm always imagining them in, but I also try to have plenty of different outfits in mind that have the same vibe. Sometimes, I don't even think of a "main clothes" option and just go with an overall vibe.
Hope I helped!