An Idiom In Sheep’s Clothing

(I am running through a rather elderly lady’s groceries.)

Me: “Did you find everything all right today, ma’am?”

Customer: “Yes, I did. Well…”

Me: “Anything I can help you with?”

Customer: “Your shirt is nice; such a lovely material. I will add that to my purchase, please.”

Me: “Oh. Well, actually, I purchased this at [Clothing Store].”

Customer: “Yes, I’ll take your shirt please.”

Me: “Um, ma’am, I’m afraid I am unable to give you my shirt.”

Customer: “No, I’m the customer. You asked if I needed anything. I need your shirt!”

(At this point, she attempts to pull it off of me. Upon seeing a fleet of coworkers heading towards me, she runs out of the store, leaving her groceries behind.)

Manager: “What did she want?!”

Me: “Literally the shirt off my back!”