Collective nouns are words that refer to a group of things or people. Some examples include:
* A flock of birds
* A herd of cows
* A pack of wolves
* A swarm of bees
If you're looking for a collective noun to describe a group of clothes, you could use:
* A pile of clothes
* A heap of clothes
* A wardrobe of clothes
However, "clobber of" isn't a standard collective noun. It's possible that it's a made-up term, perhaps used in a specific context or in a fictional setting.