I'm not unhappy about the chest tbh, but the shoulders/arms, I'm not sure how bad I look in it, but it was clearly made copying designs for people with somewhat larger arms. Still, i'd certainly rather wear loose than tight.
it's very much hit and miss with Ubac's i think. I have three of them. One fits absolutely perfect, the other fits nicely on my chest but the sleeves are to bloody short and the third is a squeeze to get into yet there all the exact same size......