I was so pleased to be finally OUT of my constrictive wedding dress I just wanted something simple, beautiful and comfortable to slip on. I went for something in ivory with some transparent parts, so it still felt bridal. I think I spent about £40, but it was worth it.
Some ideas:
http://www.foxandrose.com/ms/sb_1/animation/sb_1-01.jpg
http://www.hartgillslater.com/mm5/graphics/00000001/StretchLaceNightgown.jpg
http://www.viecouture.com/wp-content/uploads/2010/06/inbloom-ivory-chemise.jpg
http://www.brideness.net/wp-content/uploads/2009/08/farwest-lacetrimslip.jpg