It would appear based on their website that they do. Thier sizes range from XXS to XXL.
Size 18 onwards can normally be considered plus size womens clothing,
There are several options availble for you. I highly suggest the following: www.lanebryant.com/, www.alight.com/, and www.avenue.com/womens/clothing/plus-size-clothing-sale .
Lane Bryant is a very good store for plus size clothing. They also have great prices on good quality clothing. They are in most towns.
You should look for Plus Size Clothing stores. Avenue Plus size clothing on Brodie Lane And Southpark Meadows Shopping Center are two of such shops. I would suggest looking at www.filthyrichfashions.com. And beleive it or not you can find a good selection of big and tall womens clothing at Walmart.
JC Penny and Sears both offer plus sized clothing for women. Prices vary based on the type of clothing.
Macy's does offer a relatively large selection of plus sized women's clothing. They carry clothing lines like J Jill that offer very stylish clothes for the plus sized.
Queen size in women's clothing is what is commonly referred to as plus size clothing. This ranges from 2X to 8X and are reserved for women with big bodies.
You need to watch your budget and find great tops for your mom. You need look no further than Trendy Plus Size Clothing: http://www.avenue.com/womens/clothing/trendy-plus-size-clothing
Plus size label is usually marked with a W after the number. The sizes range from 14W to 32W
There are quite a few really great websites that offer womens plus size clothing. A store online called Blair has great prices and they ship fast.
One Stop Plus has a lot of clothing on sale and their size ranges from 12W to 44W. Simply Be has a smaller range from 10W to 28W, but they offer 30% off your first order.
Macy's does carry plus sized women's pants in the stores and online. Their catalog is right here for plus sized clothing.