Yoga pants !!! I love them (: I wear them and yoga shorts haha . But then again I wear them even not pregnant . But try to start to buy comfy clothes . Me personally , I never had to buy any different clothes at all . Cause I stayed in my same size clothes with both my pregnancies and I was all belly with both them .
Right now, it's just bloat. But I suggest you invest in some comfy stretchy pants. My favorite are yoga pants! The are the most comfortable thing out there for me! So look for sale racks. :) I'm 36 weeks and still really just wearing yoga pants. I don't wear maternity pants that often.
I'm 23 weeks and I've grown out of all my jeans but 1 pair. Just try and stay comfortable as much as you can. I wear sweats, skirts and basketball shorts.
I'm 17 weeks and somedays and I still wear my pants. But I like to wear maxi skirts and sweats now. But they are getting a bit tight now.