I also like the idea of changing my characters' outfits, as I prefer a more realistic approach. However, I also like to give each character their own distinctive palette, which is going to stay pretty consistent.
For example, Adrian loves his biker outfits in muted earth tones and there's no way you're gonna change his mind about it :'D
You could see him in grey, black or muted blue sometimes (in the last pic, for example, he's wearing a grey shirt, thouh you can't really see it with all of that light
), but overall he's mostly going to stick to green and brown.