There is a static spray you can get at most supermarkets

Increase humidity in your home; static cling is lessened when the air is humid. …
Increase humidity in your clothes. …
Separate and conquer. …
Air dry clothes. …
Use fabric softeners, dryer sheets, or bars.

Sadly, it may be due to the fabric and possibly mean there is no fix. There are a couple of suggestions already made that may be worth trying, just to be sure

I use fabric conditioner in the final rinse and it stops static.

A professional dressmaker told me that it can be from different types of fabric coming into contact with others.

I used to work at Suzanne Grae. They sell an excellent anti static spray. Works like a charm. I think you can also get it from supermarkets.

When you put them in the dryer, there’s plastic/rubber ball things you can throw in with them to stop the static. Not 100% sure it works for when you’re wearing them as well though. Worth a shot though

there is a static spray you can buy from the supermarket.

You don’t say whether you put them in a dryer or not? If you do … don’t .. try drip drying. If all else fails you can spray hairspray on them.

Anti-Static spray! It works wonders

Avoid putting clothes in the dryer. Or you can get a static spray from most supermarkets.

Get a metal clothes hanger, and run it over your clothes either just before you put them on, or just after you put them on. Guaranteed to get rid of static and that awful clingy look. Also, apply a moisturizing lotion on your body where the fabric clings, and hey presto, no clinging!

I use static spray from the supermarket. Avoid putting clothes in the dryer as well.

dont put them in the dryer

there are some good comments here

OMG this happens with one of my new dresses. Thanks for asking!

Ive also hear that hairspray works although i have not tried it.

you can get static spray. People usually use it on stockings but I assume it would work on clothing aswell

Hairspray and antistatic from the supermarket.

I had thought of something metal as a solution too, to absorb the energy. Have used the spray successfully in the past but wonder if there is a scientific answer somewhere!?