Guy's Behavior

Why do boys suddenly change their style the clothes their wearing?

There's this guy (my crush) (we also both like each other) and I have noticed in the past month that he suddenly just change his clothes style. It went from this baggy skeleton zip up hoddie with shorts (he also had a long curly type of hair and never wore any kind of hats) and then bam! He turned into this cute/hot person with hoodie and jeans he also cut his hair which is a pretty dramatic change because he has had his long hair for 5 years. He also started wearing hats which is efing weird because today is the first time I saw him ever wearing one in school. I don't know why hats are so popular with boys. I don't know might be weird question but I'm just curious. Did he do it because he wants to impress someone or just going with the trend?
Why do boys suddenly change their style the clothes their wearing?
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