Yes, I went into stretchy pant mode early on...around 8 weeks I noticed that I couldn't button my jeans and sit comfortably, so I got a great deal at Forever 21 for a pair of maternity skinny jeans and wore them until the weather got warmer. At 10 weeks, I got a great deal on a long maxi-style maternity skirt from Gap, and I basically wear that non-stop because it's SO COMFORTABLE.
I too have had to pack away a few shirts...I am slim and always wear things a bit more form-fitting, so my clothes haven't had much room for growth or else I think I'd be ok so long as there wasn't any buttoning! lol
I'm really starting to wonder about shorts though. I have a pair of running shorts that I thought would work, but I'm already having to slide them down below my belly...which makes them look odd...and normal maternity shorts are looking a bit frumpy...
I do have a few maternity dresses leftover from my son's pregnancy that I wear here and there, and two maternity shirts that I did finally wear (tank tops) and surprisingly they fit well. My belly appears to have actually fully popped. Even my hubby is noticing it as looking LARGE...lol, so clothing is becoming more of an issue.