I would dress Miko in that green harness! I think it's soooo cute 
 
Miko doesn't really have any Really masculine stuff...LOL  He has a few shirts and then my hubby just bought him two hoody sweatshirts that are meant to be a Little baggy and they also have a single long pocket at the bottom of the sweatshirt with openings from the left and right sides, if that makes any sense at all!! It also has a hole for the harness, if you put the harness on underneath the clothes. And there's a little drawstring under the big pocket.