quantifier + (aways) plural nouns

Hi, there are quantifiers, that are used with uncountable nouns, and quantifiers used with countable nouns. Some countable nouns are usually plural (shoes, boots), some are always plural (jeans, pyjamas, sunglasses). Is it possible to use a quantifier + jeans/pyjamas? Or do I have to use the word"pairs"?
They stole a lot of/many/some jeans from the shop. (is that ok? or do I have to say) They stole a lot of/many pairs of jeans from the shop?
the same questions goes for:
There are a lot of sunglasses in the shopwindow. or There are a lot of/many pairs sunglasses in the shopwindow.
Thank you very much for your answers and tips and I hope it helps other people, too.