Custom Blue Butterfly Polyester Round Neck Short Sleeve Knee Length Dress M. Description. Custom Blue Butterfly Polyester Round Neck Short Sleeve Knee Length Dress M. Product Detail • Color: Blue • Material: Polyester • Type: Dress • Department: Women's • Neck Style: Round Neck • Sleeve Length: Short Sleeve Please message me if you have any questions. I stand by all of my items before and after purchase. Please see my feedback.