Have you notice that most people, if not all, (including ourselves) have the wrong haircut and use the wrong hairstyle? Sometimes we wear clothing, colours and styles that do not match our face and body shapes and sizes, and skin colour. Why is that?
Personally, I know what (how, when, where...) to wear, but the majority of the time I don't care.
I don't wear a hairstyle that suits me, because there is no hairstyle that suits me. My hair is thick, and wavy, and fluffy. I fucking hate it, because of it i cannot have any legitimate hairstyle. Its just semi-long and a thick, wavy, fluffy mess...
Because it's hard to know what is the right hairstyle
I know what suits me best and it's different from what others think suits me best. I have thin hair which works best if it's short. Otherwise, my scalp becomes exposed. Most people don't realize this and say I'd look better with long hair, when that's not true at all.
I don't care. Having short hair (pixie) a lot of people go, oh you would look so pretty with long hair. I don't think people care what others think, all that matters is what that person thinks themselves.
I think that it's mostly your opinon and some people choose not to bother with their hair because their afraid of drastic change. I don't know much about the clothes bit but a lot of clothes can be expensive