Most unwashed new clothing and fabrics imported into western countries are sprayed with formaldehyde for transportation and shop display. You could certainly be reacting to that many hours later if you didn't give it a proper wash first.
I can see how this might seem a little humorous to you man, but considering the fact that OP is probably going through some kind of paranoid phase in reaction the Cocaine, it's best not to laugh at and/or make fun of his situation. I'm not trying to say that you're malevolent, but let's try to support each other instead of pointing and laughing at those who are down and out. Okay?
My opinion is that the issue will most likely resolve once you are finished smoking Crack Cocaine and comedown. It's my belief that you are probably just going through the paranoia that is so common when using powerful stimulants like this. If the symptoms don't resolve, kindly get back to us and we will go from there.
Ues the sizing in clothes can irritate. That's why they recommend washing clothes before you wear them. If you have Epsom salts try them. You have nothing to lose. Good luck!