I tried on some maternity pants and found them so uncomfortable!! I have a belly belt which comes in a set of 4 elasticised bands, which you thread through a piece of fabric which you tuck in to cover the gap where you can no longer do up the fly. Best thing ever!!!
I was doing the hair tie loop thing, but this is so much better - and you can attach the belts together as you get bigger. I usually wear longer tops, but if I need more coverage I just put a belly band (the boob tube type thing) over the top of my pants.
As the weather is warming up I'm also wearing more dresses with leggings. Most of my non-maternity dresses are fairly loose around the tummy anyway so they are still comfy. If I need a bit of coverage on the arms I have a collection of baleros that don't need to do up anywhere near my belly.
I'm basically planning on buying as few maternity clothes as possible and just adapting my current wardrobe. Not particularly hard as I've never been one for really figure hugging clothing anyway