...it was a SKI trip, and while it MAY have been scheduled through the school, it wasn't like he needed his algebra book. Second, he KNEW about the trip, and it wasn't SKIS he needed, but some "stylish" clothes he wanted to wear. Maybe if he WANTED them, he should have been more careful when he packed to LEAVE.
But REGARDLESS, it is NOT Dad's job to ensure that junior has his Gap hoodie when he leaves, if he needs it for a trip, it is the job of the SEVENTEEN YEAR OLD YOUNG MAN to make sure he has it. THAT is entitlement.
Why give a "senior" discount, they have had plenty of time to raise the money...