If the parent doesn't trust their kid's judgement on purchasing a fucking piece of clothing, why did they let their child go to a show unsupervised?
And it was either money that the kid earned him/herself with a paycheck, or it was money that the parent allotted to them, again, trusting their judgement.
Just be happy that they bought a sweatshirt and not an actual handgun.
Kid: Mom, I'm going to a show
Mom: Nice dear, who's playing?
Mom: Ok whatever.
Kid: I'm back, ma. Got this nifty sweatshirt.
Mom: Whawhawhaaaaaa? Senseless violence!