i'm a plus size?

at least i am according to this! http://www.etsy.com/view_listing.php?ref=cat2_galley_7&listing_id=17281665 i'm roughly a 10/12 but as sizing varies on most garments, i go by measurements. i'm 36-29-40 and 5'5". i weigh in at roughly 150. i know i could stand to tone up but i am insulted to think that a size twelve is a plus size. i suppose to a girl who looks like she hasn't eaten a square meal since momma weaned her off the tit, i may look a bit zaftig. i will never buy anything from this seller no matter how lovely it is. yes, a dress with a 40" waistline is a plus size but a size twelve IS NOT! i'm gonna go eat a scone in protest.