The purpose is specifically looking attractive or interesting.
I find the girl in the shirt both interesting and attractive. I would find any girl in that outfit interesting and attractive. Think of it like this.... It's a ticket for free high priced meals and drinks.
Keebler might understand better if it was a ripped firefighter in a torn 1600 dollar shirt and designer distressed jeans. He might still wish the shirt was water and fireproof. .. But he wouldn't want it to be tear resistant.