I LIVE in Tru Luxe Jeans! Have you heard of them? They're actually headquartered in Dallas, and they have the BEST stretch for my "extra new mommy weight" Plus the styles are FAB. I bought a pair when I was at 3 months, and they made me look like I was 3 weeks! haha
TruLuxeJeans.com is where I always order (they have a really simple size chart).
I always put a pair in gift baskets at baby showers because they're also really great on pricing (and the look and feel is even better than my old MMeJeans)!