Where did the customer get the sweater?

Allen: Excuse me. Could you help me? I’d like to exchange this sweater.
Clerk: What is the problem with it?
Allen: It was a birthday present, but I don’t really like it. I think I want something plainer.
Clerk: I see... Well, Why don’t you look around.
Allen: This one looks nice. I want to try it on. I kind of like the black one.
Clerk: I think the red one is longer and a little looser so it will be more comfortable.
Allen: True, and it feels softer.
Clerk: And that color looks better on you. Actually, it is better quality and it is the same price as the sweater you are exchanging.
Allen: You have talked me into it! I will take this one instead.
Clerk: No problem, I will switch them for you.