So at 19 weeks pregnant my belly is getting pretty big and my pants really don't fit any more. When I was pregnant with John I went from a size 8 to a size 16 (far too much chocolate!) so as I got bigger I just bought the next size up. I did buy a pair of maternity jeans (and borrowed a pair off my sister in law) in my last trimester.
This pregnancy since I started at a larger size buying bigger sized clothes wont really work so a friend told me about the hair tie technique. So easy take a hair tie and loop it through itself through the button hole then simply loop the hair tie around the dome or button. Voila! easy cheat pants! I think this will last me for a quite a while. The girlfriend who told me about this was seven months pregnant so I guess I have a bit of time up my sleeve.