Kilt to prom on Glee tonight in prime time!

[Galician]

That is an interesting point about the fur. It might very well be that they aren't aware of leather as an option.

On the other hand, in this day and age, attending a social event doesn't seem to require the wearing of a sporran. All that one needs to carry for the few hours spent while attending is cash and one's car keys (or a Metrocard here in NYC). So maybe they just consider it too bulky for comfort or for the look they want.

P.S. Change cash to a credit card!