Why does the woman want to keep the skirt?

W: The skirt is a bit too short, but it is a good buy. I’ll take it.
M: Well, that doesn’t make sense to me.

W: Hey, why’s your foot bandaged up? What happened?
M: I was going to be late for work this morning, so I had to hurry. I was trying to get down the stairs quickly and I slipped and twisted my ankle.
W: Ouch!
M: Yeak. The reason I didn’t wake up on time was because the batteries in my alarm clock ran out last night.