I saw this idea on another blog, and thought I'd give it a try. The idea is to make cheap maternity shirts with clearance shirts you find (or Goodwill shirts, Salvation Army shirts, just cheap shirts!). I found 3 shirts I liked and bought them 2 sizes too big. This is important so you have room to grow!
Then you sew elastic on each of the side seams. The more you stretch the elastic, the more the sides will bunch. This is personal preference. I don't think any of the 6 seams I sewed ended up exactly alike.
But then, I am not a professional, nor did I feel the need to use silly things like pins to help myself out.
I am an eye-ball-it kind of sewer, at least for now.Then, you get a finished product: a nice shirt that will grow with you without spending a ton of money!!