Advice for my husband?

So my husband and I recently entered an open marriage. He's been having trouble getting anyone to look at him, talk to him or even text. It's really hurting his self esteem and I tired giving him some advice but it doesn't seem to work. If anyone has any suggestions please let us know. He is a great guy and he is handsome. I'm not sure if it's just because he is just awkward? He does mostly dress in t-shirts and jeans haha. Maybe dress sharper?