Karin Stevens Dress Stretchy Bodycon SZ 6 but fits 8-9. Purple Green Black shift

90s Karin Stevens Shift Dress says Size 6 but I wear size 8-10 and it fits me. Lots of stretch. Purple, green, light green, peacock feather like pattern. Black trim. Looks really good on! Ptp 18" Bust has darts Waist 16-17" again this fabric stretchy Bottom is 21" laid flat. 3/4 Sleeves 17" Total length 34" Across the back 15-16" from top of sleeve