How about a little history today? How about a little pants history? It's an interesting subject.
* Nomadic Eurasian horsemen such as the Iranian Scythians, along with Achaemenid Persians, were among the first to wear trousers. Funny that they wear galabiyyas now, which I think look pretty cool.
* In ancient China, trousers were only worn by soldiers.
* The first European appearance of trousers was in Hungary, in the 9th century.
* Trousers were introduced into Western European culture at several points in history, but gained their current predominance only in the 16th century, from a Commedia dell'Arte character named Pantalone (the Italian word for trousers, thus, pants).
* In England, in the 12th century, peasants were often seen in long garments to the ankle, rather like trousers. Strangely enough, trouser-like garments, which became rare again in the 13th century, vanished altogether during the 14th, and scarcely reappeared for 400 years.
* By the end of the 16th century, the codpiece had been incorporated into hose, which were roughly knee-length and featured a fly or fall front opening.
* During the French Revolution the male citizens of France adopted a working-class costume including ankle-length trousers in place of the aristocratic knee-breeches. This style was introduced to England in the early 19th century and supplanted breeches as fashionable streetwear by mid-century.
* Breeches survived into the 1940s as the plus-fours, or knickerbockers, worn for active sports and by young school-boys. Types of breeches are still worn today by golfers and baseball and American football players.
* In Great Britain, "pants" are not trousers, they're men's underwear. Likewise, "knickers" are not knee pants, they are women's underwear. Remember this if you ever go there.
* Sailors may have played a role in creating trousers as a fashion around the world. In the 17th and 18th centuries, sailors wore baggy trousers known as galligaskins. Sailors were also the first to wear jeans, or trousers made of a fabric that came from Denim, France (for Serge de Nîmes). These became more popular in the late 19th century in the American West because of their ruggedness and durability, and survive today, easily the most popular pants of the modern world.
The Codpiece Hose: I think this probably came first from armor of the Medieval period designed to protect the nether regions of the male anatomy during battle. Later, it became a fashion statement by which men could promise more than they actually had, much like the roll of socks thing that rock stars used in the 70s. Maybe they still do, I don't know. I don't look anymore.
Balloon Pants: These are by far the silliest pants ever designed for men to wear. What's worse is that men, important men like William Shakespeare, Sir Walter Raleigh, and many of my famous Waller ancestors actually wore them.
Fall-Fronts: In certain parts of Europe in the 18th century, these were made off hot, non-breathing, unforgiving silk, and were v-e-r-y tight. Their obvious purpose was to 1) allow quick and easy access, 2) show off a shapely calf, and 3) show off your junk. I have two pairs of breeches, which I wore when I used to portray Mozart in the public schools, and they're damned uncomfortable. And I don't even have junk to get smashed.
Hip Hops: So this is heretofore the culmination of fashion evolution? Now men are showing off their backsides instead of their fronts.