When shopping for sexy plus sized clothes, keep in mind that the clothing is intended for your body, not the hanger or the model who's wearing it.
Hopefully you know what your best features are and should choose clothing to accentuate them. For instance, empire waists are great for women with a larger bust while a more fitted look will look better on someone who is a bit more thick-waisted.
You can also select clothing that will downplay features you're not so fond of. Most importantly, choose clothing with your spirit in mind. If you do, every time you wear your new threads, you'll radiate self-confidence -- and that's always sexy.