Don't like the caveman look because I'm a hygiene freak and I really like cleancut guys who look neat and tidy! There's so much more to looks and appearances because women tend to read too much into things like "oh if he's unkempt he probably doesn't have good hygiene habits or he is probably an untidy person", or "oh he dresses sloppily, it probably means that he doesn't care about himself blablabla". It could also work the other way around, like "he dresses well, he is probably full of himself since his appearance means so much to him". Our first impressions of others are usually based on appearance, and since a longgg time ago royalties, socialites and elite upperclassmen have been setting "trends", like being well-groomed & looking smart & spiffy, so mix these 2 together...and you have what we have now.
I have talked to a lot of my girl friends about this same topic, Most of us agree that the more manly/ caveman look is way more attractive. I don't know what sparked the change but I'm not a fan of it. I like clean cut guys to but I should be the one wearing the skinny jeans in the relationship.
Hygiene, I am sure in the past no one minded that you smelt like sh*t because everyone smelt like sh*t but now there is not excuse. It is easy to shave, it is easy to keep a healthy fresh scent, and unless you are homeless there is not reason why you should wear rags. To add, men are competing against other men, men that offer a sharper look tend to give off the idea of luxury and affluence. Both traits women love from the beginning of time. What would previously only be fit for kings is now fit for the masses (i.e. having clean teeth, nice clothes, etc.)