I believe you can email support@hitechcreations.com and get permission to have their logo put on a t shirt, hat, or whatever by a 3rd party like cafe press.
I asked this a while back as a wish, HTC or Pyro (cant remember) said it was ok as long as I did not sell the shirts, I even asked for a copy of the logo and someone sent it to me.
I do have a Aces High / Hitech Creations Coffee mug, I was considering do a Tshirt that said "Aces High" on the front and on the Back (Hitech Creations with the Aces High URL and a random Squad logo) and present to FSO squads a few years back, but It received negative reviews.