but is pluralized, same as the word pants in english, which is plurel even though it refers to one unit, or does pantalón mean "a pair o pants" while pantalones means two or more pairs?
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Spanish Word For Pants
Esquela
In Spain, you can use "pantalón" or "pantalones" to mean one single pair of pants/trousers.
"Me he comprado un pantalón" (I've bought a pair of pants)
"Me he comprado unos pantalones" (I've bought a pair of pants)
When you want to make clear you've bought more than one you usually say the exact number.
"Me he comprado dos pantalones" (I've bought two pair of pants)
Inselstricken
el pantalón = what we call a pair of trousers in Europe.
we understand the word / pants/ to mean underwear, underpants, knickers - that's pantaletas or calzoncillos
if you are American you will be familiar with Merriam-Webster dictionaries :
http://www.spanishcentral.com/translate/pantal%C3%B3n