How can I express to my boyfriend that he dresses ugly?

Anonymous
I love everything about my boyfriend, except the fact that he dresses very ugly. I work/hang with people in fashion and cosmetics and I feel it becomes an issue when we are out around those types of friends/people. I'm not asking for much, I am just sick of seeing stupid graphic tshirts and pants. I feel embarrassed when I'm dressed really nice at a party, and so is everyone else, except my boyfriend. I need to know what's acceptable to either tell him straight forwardly, or give hints? I don't want to hurt his feelings or offend him ... but it is an issue with me that I feel will be a constant problem since its directly related to my career/social life too.
How can I express to my boyfriend that he dresses ugly?
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