Weekly Tips: No. 5
Why can we wear "clothes" but not "cloth"?

Cloth (uncountable) is the material, or fabric, that is used to make clothes.

For example:

This dress is made from very expensive cloth.
This shop is famous for having many different types of cloth.
How much cloth did you buy?

Clothes are always plural.

For example:

What clothes are you going to wear tomorrow? I hope we don't have to dress formally.
She bought a lot of clothes in the sale, but later realized that most of them did not fit properly.

If you want to talk about clothes in the singular, you must either be specific, and talk about a shirt, a skirt, a jacket, a pair of pants* and so on, or use a general term such as an item (of clothing) or a garment.
*1.Note that in British English, this is a pair of pants, while what American call a pair of pants is a pair of trousers...
2. It seems very illogical that pants and trousers are plural nouns while a suit (which is a jacket plus a pair of pants, and possibly a waistcoat) is singular...

For example:

All my clothes are dirty except for this jacket.
The main fashion item for men next season will be the skirt.

Finally:
Where Japanese uses 着る,着ている,履く, 履いている, English will use "put on" (or "dress") and "wear".

For example:

It's really cold outside. You'd better put a coat on.

A: What are you doing? Aren't you ready yet?
B: I'm just dressing. I'm a bit slow because I'm having trouble with the buttons on my cardigan.

I normally wear jeans, but today I am wearing a suit because I have a job interview.

(For more on these verbs, see this part of the BBC Learning English site.)