For plus size clothing have you tried Catherine's?
for summer clothing they always have a very nice
amount to pick from. Also Boscov's carries a nice
amount of plus size. fashion bug also.
They both carry from shorts to formal wear.
one stop shop for everything.
hope this helps you out.
The all three have web sites for you to see what they have.
www.catherines.com
fashionbug.com
boscov's.com
sammy