B basically lives in oversized hoodies with various other shirts underneath, he'd understand. He might have even stolen one or two of Steve's without really realizing it.

"I hope not. I mean, I'd stop if you asked," B adds. "Or at least be more subtle about it." He's not exactly blatant about it, as it is, though. That's half habit and half deference to Steve's clear discomfort with being oogled.