In the interests of trans-Atlantic and intergalactic communications, not to mention regional dialect differences, just how do you refer to those blue cotton trousers? Are they jeans (my own favorite)? Or are they denims? Or do you use the name of a specific brand to refer to the entire species, as in "look at the girl in the tight Levis"?

Please feel free to expand the discussion to whether they are called 'pants' (the word usually used in the US), or whether that word specifically refers to the garment worn underneath 'trousers'.