How stretchy are Lululemon Grove pants? Potpartum/sizing question

[Anonymous]

Ideally, I'd love some great fitting yoga pants for postpartum that will still fit me when I loose weight. I am gaining about the same as my last pregnancy, so here are what my stats will probably be. 5'2, about 140 at 10 months pregnant, and about 117 after that initial burst of weight loss (I think the first time I weighed myself was 4 weeks postpartum). Normal weight fluctuates between 105-110 but it takes a few months to get there. I wear a 2 in most American pants, but according to the Lululemon size charts, my waist is too big--26 inches normally and certainly bigger postpartum. My question is, how stretchy are they? I mean, I'm still in my Old Navy yoga pants I wear as pajamas at 32 weeks pregnant, because they stretch like the dickens.