What kind of trainer do I need?

[penguinande]

DD is consistently peeing in the potty during the day, but is resisting pooping in the potty. I've been using loosely snapped simplex, but she still calls them 'diapers' so I want to get something that will seem more like underwear to her. I don't need a lot of absorbency, and I don't plan to use them at night, but I would like a trainer that will contain poop and is easy to get off for changes (side snaps, perhaps). I'd also like them to look as much like underwear as possible and not be too pricey. Anything like that out there? Thanks!