I have this pair of pants that I love, I mean I really dig em cause they've got soul and character (one of the legs actually ripped clean off below the knee so I turned em into cut offs) but the zipper just wont stay up. The pants arent to small for me or nothing. I really dont mind walkin around with it down but sometimes it can reveal my naughty bits and I just want the zipper to stay up (I'm really not into the draft)
Stick one of those really tiny saftey pins through the hole in the end of the zipper and then pin it to the inside of the flap that covers the zipper!
Go to your local tailor/seamstress ~they should charge you like $5.00 to $10.00 to put one in~you can always call around for the best price~