Everything about The Winter Soldier’s outfit screams I am a wild animal that needs to be restrained.
His leather jacket resembles a 1940s straightjacket. His face is muzzled so he can’t communicate well. Even his gun holster goes right across his chest rather than across his shoulders, like Steve’s does.
It makes me wonder how many times Bucky tried to escape on a mission before HYDRA created an outfit to remind him that he’s controlled and owned, even when alone.