I got small rashes on my neck and collarbone, maybe because of the new silk pajamas I bought.

I recently bought a pretty new pair of silk pajamas online to cheer myself up. I was so excited that I didn't wash them and wore them straight to bed last night. When I woke up this morning, the nape of my neck and the area around my collarbone, where the pajama collar had touched, were red and covered in small, itchy hives. My skin is so sensitive that I think I reacted like contact dermatitis to the fabric chemicals left on the new clothes. As a temporary measure, I quickly took them off, put them in the washing machine, and am currently applying a cold compress. Everyone, please make sure to wash your new clothes before wearing them, even if it's a hassle.