I can't recommend any new pants, but I can speak a little to a zipper busting open having recently replaced the one on the right leg of my Fieldsheer Highland Suit. I suspect that if you look closely at the inside of the zipper pull that you'll see the piece that connects the outer halves has cracked. Can't maintain enough pressure to keep the two halves together. Off it comes.
Assuming your zipper is the same size as mine, you won't find a replacement pull at your local sewing store - even if you do find something that appears to be the right size (like I though I did), it won't work. Find a place that replaces them with YKK. I got mine done at a local shop that does all kinds of repair work (mtnsoles.com). They were recommended by my local REI and a tent company.
$20 was a much better price than a new pair of pants. Though that is coming soon for other reasons so I'm enjoying this thread and the recommendations.
2009 DL650A Grey
2004 DL650 Blue - sold
Long ago TC-90
Last edited by mcdstrom; 04-21-2010 at 03:31 PM.
Reason: adding the last line