Why does my torso look extremely broad when i wear my hocky stuff?

I have rbk 3k shoulder pads and a jersey thats like a giant T shirt. Im 15 and i got into a hockey team, i used to borrow equipment from the pro shop and the 1st jersey i used was one that fit well and had the long skinny sleeves. But I finaly got my own equipment and i got a jersey for like $12 and its not like the other one its really long and the sleeves are really huge and not skinny. And my upper body looks like a huge square with normal legs. Why is this? And is it a style of jersey or whats wrong with it?