All the items you refer to are plural nouns, therefore you need to use "these". You use "this " with singular nouns. Examples: this book, this film, this shirt, this tie, this hat etc.

All the words you mentioned are plural and you have to use "these" for plural nouns

You mean in your question if the words " pants, jeans, socks, shoes, etc." are considered as exceptions. But they are not.. We directly use them as plural nouns, So, the answer is to use "these" with such plural nouns.. Keep on.. ^_^

THESE