I ordered 2 of these.  One for my mom, in a 16 Plus and it fit her true to size.  I'm a size 14 and I ordered a size 15, but it was too small.  I think it's juniors sizing? I'm not sure, I think I was supposed to order a 14 plus but they were out and I figured a 15 would fit.  It did not.  I didn't care for it anyway, but my mom likes it.  Make sure if you're ordering a plus size, to order the sizing that says Plus.