Since the rash has appeared suddenly after wearing the organic clothes, hence it looks like contact dermatitis to the clothes or the moth balls kept in the box. It does not looks like a fungal infection. Keep on giving the antihistaminics and steroids that the dermatologist has prescribed. If the symptoms are severe then please get an evaluation done from a dermatologist.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.