Don't waste your time and money at places like La Senza and Victoria's Secret. If you want a bra that fits and will last you a long time, go here, or another specialty store, like Dawn's Bratique. The staff are so knowledgeable and they will find you the perfect bra.
If you go in for a fitting you will likely be shocked at the difference between what you think your size is (i.e. what department stores and cheaper brands have convinced you) and what you should actually be wearing. 7 out of 10 women are wearing the wrong bra size, and most of them are buying cup sizes that are too small and band sizes that are too big. I myself wear a large cup size that cheaper stores don't carry, and if they do the band size is way too big. Once they find you your perfect bra and you try it on you will not want to go back to wearing your La Senza bras. Sure, you will probably pay $100-$150 for one bra, but to me it's more economical, better for your health (there are SO many issues that come from wearing a bad bra, especially if like me you're rather busty), and better for your own body image to buy just one or two bras that fit and will last than to spend the same amount on 6 or 7 bras that will sit in the drawer or get thrown out because they don't fit or the fabric ripped or stretched out too much etc.
The lady that helped me was very sweet. She was so knowledgeable, so helpful, and so understanding of the issues I have finding bras that fit right. I wish there could be more salespeople like her working in retail stores--I've never found La Senza's staff helpful. I bought a Freya full cup bra for about $140 and I feel like throwing out all my other bras. I'm going back soon to buy one or two other bras and start slowly replacing my bra collection.
Oh--another plus, they keep your name, your size and the designers you prefer on file, so that when you go back they can efficiently find you what you need. Also makes it easy for a significant other to shop for you.
For women larger than DD, there is a beautiful selection of bras up to K cup that offer excellent support in the same sexy styles the other stores would only carry up to D. You don't have to settle for a bra your grandmother would pick out.. read more