There are a number of places where quality cycling trousers can be purchased. Sites such as Wiggle, Beta Brand, Cycling Sports and Cycling Deal all sell cycling trousers.
In German, trousers are called "Hose."
They are just Low Crotch Pants/Trousers.
Bombacha
They started wearing pants in the 1880's in Paris. The pants in question were called bicycle pants, and were made for cycling. They were extremely loose fitting so as not to be indecent and show the shape of the females posterior region.
bloomers
truffles
strossers
jodphurs
Track cycling is done in a velodrome.
They wear jeans.
Tartan trousers worn in Scotland are called trews.