What is the name for things like wigs, lashes and hair?

We call these "cosmetics": skin moisturizers, perfumes, lipsticks, nail polish, eye and facial makeup, etc.

Then what's the term for things like wigs, lashes and hair?

These things could be called

accoutrements n
additional items of dress or equipment, or other items carried or worn by a person, or used for a particular activity
_{Oxford Dictionaries}

For example, accoutrements of fashion is attested.