It's "tights are". It's incorrect to say "tights is" because "tights" is a plural noun, which requires a plural form of a verb.
It's "tights are". It's incorrect to say "tights is" because "tights" is a plural noun, which requires a plural form of a verb.
Your tights are really lovely.
Your tights is really lovely.
Be also aware that you cannot use the article "a" with this word ("a" is for one). However, you can use the phrase "a pair of tights". This expression takes a singular verb because it refers to a single entity.
There is a pair of tights in my drawer. (not "There are...")
Follow the same strategy when using other verbs, such as fit, look, have, etc.
Your tights look chic. (not "looks chic")
And remember, we always use a plural determiner or pronoun (they, these, those, etc.) with plural nouns.
Those tights fit perfectly! Where did you buy them?
A list of clothing-related nouns that only have a plural form, and therefore take "are":
