In most circumstances, Angel typically prided himself on being aware of his surroundings and alert to changes in circumstance. Not only was he a tad paranoid when it came to surprise, violent guests showing up unannounced, he also had the nose and the ears to pick up on the smallest scent or sound yards or more away. So, there was no good excuse for him to completely miss Kate's arrival, and especially no good excuse that he didn't realize she was there until she spoke.
"What the fu--," he started to say but as soon as he jerked around and simultaneously tried to both cover himself and reach for the towel on the floor, Angel slipped and fell back on his naked ass. His hands made a quick search for the towel until he managed to partially cover himself before standing up again.
"What are you...uh," Her question registered, and he glanced at the closet. "They're not the same. Just... similar."
Wait, why was he bothering to answer questions about his wardrobe? He shook his head and carefully wrapped the towel around his waist, making sure it was more or less secure.
"Kate, what are you doing in here?" He wasn't a stranger to her phasing in and out of the common rooms apartment, but she'd never passed through the walls into his room. He liked Kate fine, but he'd rather her not, you know, walk in on him fresh out of the shower still naked.