you have been given some great tips here.

the only thing I will add is even if I wear my trackies out, which I do often as I walk with DS everyday. I always put on some powder & gloss & a killer pair of earings....makes me feel a little nicer. And if you can't find jeans or have trouble I second the leggings, lots of different tops can be worn with them....look great with a nice pair of flats.