We can go on and on about the singular and plural questions but in my own opinion, I agreed the qualifier
Is very important. For clothing, I would say either “too much” or “too many” works but it must be in the right context and with the right qualifier.
I drank too many cups of coffee this morning which kept me going to the washroom
I drank to much coffee this morning which kept me going to the washroom.
I put on too many pieces of clothes this morning when I left the house and now I am hot.
I put on too much clothing before I left the house this morning and now I am hot.