There are many places to buy BDUs. Some include military surplus stores in your area, airsoft or paintball stores, or military surplus stores online. For example:
Evike.com
.Airsplat.com
.bdu.com
BDU pants can be purchased directly from their website. They can also be purchased from retailers like Army Surplus World, Patriot Surplus and Amazon.
Propper is a manufacturer of military and tactical clothing among other apparel items. Many of there products are available for purchase online and in Army Navy surplus stores. BDU Pants are one of their products and make up part of the Battle Dress Uniform in combination with a BDU Coat, BDU Hat, T-Shirt, and other necessary accessories.
Which movie? For the most part its a pair of SF black BDU bottoms
There are some waterproofed BDU out there but the standard that you would get from a surplus are not. However, I have spent 7 hours in approx. 3 feet of snow in a rain storm wearing nothing but long underwear, BDU, and what I would wear on a normal day and i was just fine.
You can purchase one Woolrich pants at USA cheap, Amazon, Cabela's also carries them you can find discounts on Woolrich pants too and get them shipped to your house.
One can purchase women's corduroy pants when one goes to stores like Victoria Secret. One can also purchase the item online at the websites of Amazon and eBay.
You can purchase lined pants online from stores such as Cabela's and Old Navy. You can also find lined pants available for purchase from retailers such as Amazon.
Wrangler pants can be purchase at most retailers like Sears. Should one not be able to find Wranglers at a brick and motar store they can try their hand at finding pants online.
One can purchase camouflage pants from a huge amount of different retailers. One can get them from Amazon, Walmart, Target, Ebay, and the store called JCPennys.
BDU = Battle Dress Uniform
You can purchase quality men's ski pants from retailers such as Amazon. Alternatively, you can also purchase these pants online from auction websites such as eBay.
One can purchase silk pants at most clothing stores around the country. Silk pants are fairly uncommon, so it may be wise to search a higher-end store for clothing.
One can purchase MX pants from most shops offering motocross gear. Some examples are MotocrossGiant, MotocrossGear, FreestyleExtreme, SlyFoxMX and MXMegaStore.