The game Farm For Your Life has a simple feature that I have not seen elsewhere: on the character customization screen, put a mirror behind the character so you can see how that hair, jacket, whatever looks from behind. Yes, you can usually spin the character around to look, but is a mirror that hard? (Probably, yeah.)
In many game genres, you mostly see your character from behind anyway. Maybe the point of view should start behind the character, like in a barber shop or hair salon, with you the customizer as the hairdresser. And spend less time customizing the exact shape of a nose you can’t see 95% of the time.