Hi there,
The Dirty hat exists and I have one! Also have a old 'Goo' hat. Bought both in early '90s from the Rockabilia catalog.
I also have the Sonic Death shirt. XL. I was probably 11 when I bought the shirt and my mom made me use fabric paint to block out the word 'Suck'.
Would consider offers or accept trades of the Sister promo poster or an '80s SY tee that's not Confusion is Sex. Sister shirt, the Wynona Rider shirt, etc. Will shoot you an e-mail.