There are a large number of retailers who sell plus sizes on line. Some such as Evans, Matalan and Littlewoods also have high street stores. Others such as Asos, City Chic are solely e-retailers. One retailer that you might like to look further into is Eloquii who follow up-to-date trends and have also set up an on-line community for plus-size women where they can upload images of themselves in the clothing so that their contemporaries can give them up-to-date feedback.
There are many places to find plus sizes jeans. I can understand your dilemma and I suggest searching at stores or online at the Levi's Company, Old Navy and Lane Bryant.
A retailer based in the UK which provides plus sized coats is marks and Spencer's. (M&S) They can be found in the larger stores or online for delivery.
You can find plus size clothes online from any major retailer. You can also shop at Wal-Mart or target stores online. Also the gap, or any outlet malls.
Old Navy has very reasonable costs and they have a big range of sizes. You can look at some of their sizes and prices online: http://www.oldnavy.com/products/plus-size-clothing.jsp
Finding formal dresses in larger sizes can be difficult because many manufacturers do not make larger sizes for formal gowns. You can find great prices and very pretty dresses in plus sizes online.
You can find the perfect swimsuit by going online to www.swimsuitsforall.com. They sell sizes 8 & up. They have very comparable prices and great styles to choose from. You will be pleased with the selection.
Plus size swim dresses are available on may websites. Alwaysforme.com is a retailer that offers plus size swim dresses. Layne Bryant has a wide variety of plus sizes.
If you mean an online retailer,I would try J.Crew.They have lots of evening dresses and have plus-size choices.The sale section is a good place to get a start,then look in the new section if you don't find what you want.
Sizes to fit is an online retailer that specializes in plus size clothing for teens and juniors. The offer a selection of trendy, stylish clothing at resonable prices, and free delivery on orders over $100.00. They can be found by following this link: http://www.sizestofit.com/
When buying plus sized clothes online, you can choose plus size specific retailers like Lane Bryant and Avenue. They have a great selection and carry many sizes. Other stores that may not carry plus sizes in store will offer extended sizes online. Look at Banana Republic, American Eagle and The Gap.
A lot of online websites may help you, most of it is buying online. Here are some recommendations: swimsuitsforall.com, biggerbras.com, or you can find some in Target
There are many clothes lines that offer plus sizes. Oldnavy.com also has great prices, clearance and has plus size clothing. Cato is another great store.