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Are these correct? If not, why? What do they mean?
1. What kind of pants are these?
2. What kind of pants is these?
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Pants (or trousers to us BrE speakers) are slightly odd in that they are considered plural. I am wearing a pair of trousers. They are black and do not have any pockets.

I don't know why...two legs? But then jumpers (sweaters) have two arms and are not talked about in the plural.

So anyway, 1 is correct.
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I have been searching for an explanation (the things we do!) The only one I can come up with is that perhaps originally 'pants' comprised 2 separate legs which were tied around the waist. I believe this is the case for the first women's undergarments.
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Comments  
What about this:

1. What pair of pants is this?
2. What pair of pants are these? (Incorrect?)
 abbie1948's reply was promoted to an answer.
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