not tight & not loose on you. they might be 'tight' on a bigger person but don't specifically get tight clothes, unless that is your style. get dressier clothes fitted. wear layers if you want to look 'bigger'. don't do bold large/thick vertical stripes...small stripes or pin stripes are OK. you can wear almost any kind of fabric and any style that you want.
I like skinny guys BUT not bones, loll anyway, embrace yourself, do not wear tight clothes because you will look like a sisi/gay boy and do not wear loose clothes because it won't be attractive at all, just fitted clothes, like for casual outfit, a fitted jeans and a shirt and a sneaker, not running shoes, t-shirt is okay as long it does not swallow you. Just make sure everything is fitted after that.