Just so long as whatever he wears expresses who he is. Like his style matching his personality. But as for specific clothing, anything goes as long as it isn't garish colors and it fits him well (no saggy pants or shirts like link ) overall I don't care too much about a guy's style except if his clothes are smelly/ripped/stained. That said, I would love to see a guy in gyaru-o fashion irl. I really like the host style within it and think it's great eye candy. I saw a guy a week or two ago with a long fake fox tail attached to his lanyard and almost freaked out because I thought he was gyaruo. He wasn't :( sad me. Anyway, I'm sure your style is fine from what you have commented on other answers
it's not a big deal for me if a guy does not wear brand names but it does matter how well he is put together. his whole attire is important, not the individual pieces. my boyfriend just has a t shirt and shorts usually and that is it.