My favorite bra ever is the "Very Sexy" Deep plunge push-up from VS. Once you wear that, you'll never go back. It's lightly lined, and has great push up for low-cut shirts! It doesn't really ADD size, just gives a nice shape
And, it comes in SO many colors...I have nude, black, light pink, red, white, blue, seafoam, plum....and a few others! I think these are probably best for the small to medium chest, but they are GREAT! Also, they have some in the Very Sexy collection that are unlined/unpadded, and I think they have larger sizes!
The other great one is from VS the signature cotton collection, and is called the "padded no-wire" but it's also very lightly padded. This is a great one for working out-lots of support and 100% cotton, in several colors and machine washes well! I wear these on the weekends for yard work, going for walks, and running those "sweaty" errands like the farmers' market, and washing the car...The signature cotton collection goes up to I think 38D or so, and there are more sizes available online and in the catalog than they have in the store.