a wardrobe
There is no collective term for a group of clothes. You can refer to them as a group depending on how they are organized. For example, you can call them a "pile of clothes" or a "bunch of clothes."
You would say "la ropa".
you would call then a group of rodents.
The control group would be a group of clothes washed with water only, without any laundry soap. This allows you to compare the effectiveness of different laundry soaps in cleaning clothes against the baseline of no soap.
"Troubling" is the collective term for a group of goldfish but I would normally use the word "group" so that people would understand me.
I would call the group as a bundle of rags.
The collective noun for a group of clothes is a "Wardrobe"
Bevy
A fleet of ships.
A herd.
no laundry soap
You call a big furry animal who is not wearing any clothes naked. This is what you call anything not wearing clothes.