For me, I like changing up the colors of my character's clothing or the logos, whatever it is, but I maintain like 4-5 variants of a clothing design. Long sleeve tunic with pants, plain t-shirt with shorts or pants, a button up shirt with pants, tank top with shorts, and perhaps a sweater with pants. V-neck shirts and plain t-shirts are very abundant xD I want to make more kinds of outfits, though. When my characters go out, I try to vary their outfits more. I am probably gonna make a lot more sketches of outfits in my sketchbook since this thread has inspired me. But I don't find characters who don't change their outfit as strange. I don't mind it, personally. It is easier for the creator, which I can guarantee sometimes we do take part in the easier routes, which I can never be mad at or blame a creator for. The professionals have done it (example: characters who have only 4 fingers because it saves time) and it isn't illegal xD I find it funny when as @WhoDrew mentions, the characters are even self-aware of it.