Here's a neat trick... If like me, you have big boobs and arms with a smaller waist, then you probably have the same issue I often do with store-bought shirts & blouses.. if you get the size that fits your arms/bust, then it is often too large around the waist..

The clever cluck over at Angry Chicken has put up a neat tutorial that shows how you can pop a bit of elastic in the back to get your waist back. Good stuff!

Hmm.. seems like the embed code isn't working for everyone. Here's a link to the tutorial.