When I started crossdressing I used to wear my sister's bra, panties and her dresses, but later on I have a whole lot collection of mine. In the category of bra I have found strapless bra to be easily manageable, as they dont have shoulder strap. One can wear it for hours without bothering. The most important thing is that they cant be easily spotted by anyone if one is wearing it under the normal clothes. My favorite strapless bras can be seen here and you can also find links to other varieties of bra.

I like to wear saree, but to get a blouse is a real tough job. Saree is getting popular among women as a formal wear these days, and I got really surprised when I saw Goldie Hawn, Liz Hurly, Anna Kournikova wearing a saree. You can see their pictures here