Clothes or clothing are always countable nouns. Clothing does not only refer to the clothes or clothing that is worn by people or sometimes domesticated animals, such as a blanket to keep racehorses warm. Clothing also referee to a covering of a surface, we use this logic when referring to 'bed clothes' sheets and blankets that cover a bed. Also you can use this logic to say this "The grass was clothed in a blanket of white" meaning the grass was covered in/with snow. You can use how much or how many depending upon the situation. "How many clothes do you own/possess" "Your room is disgusting! look how much clothing is scattered about the floor, clean it up now" I'm sure you mom/mum might have said that to you when you were a child. is clothing plural of clothes? no because clothes is already plural, and a single shirt will be referred to as 'clothes' in English. Or 'a shirt'. If you were wearing only a shirt, natives would say take your shirt off, but if you turned up in drunken state in hospital; wearing only a shirt, a doctor might legitimately say, "remove your clothing we need to examine you"

Clothing is used like mass nouns. It is very useful when we want to talk about just one garment because we can use it with other nouns like item and piece in constructions such as: a piece of clothing OR one item of clothing Here are some sentence examples: She didn't realize how much clothing she had on the floor. She didn't realize how many clothes she had on the floor.

"clothes" is a noun used only in the plural

In response to SU.KI Then this is one more myth or one of confusing explanations; perpetrated on the internet that is relied upon by so many learners possibly leading to the question in the first place.