I got the Glassons pants when I was preg with Isla. Had to get them at 8wks cause my bump started to appear pretty early on and I grew out of my work pants but they lasted me right throughout pregnancy. I think they stretched as I stretched! lol They were a size 8 so I was pretty stoked to still be in size 8's at 42wks preg and carrying an 11lb 8oz baby! lol I most definitely was not still a size 8 by then.... I think the stretchy waistband helped me out a bit
I can still wear the pants now. The waistband is a bit baggy but the butt area fits perfectly. I just fold the waist band over a few times... it holds my marshmellow belly in now