Alice and Olivia Diana silk floor length dress

worn once for a wedding. the length has been altered from the original length. I am 5'6" and wore it with 3" heels. after the ceremony, I put on sneakers and the dress was to the ground, but not touching the ground. from armpit to bottom it measures 51" this dress ran a little small, as various A+O fits do, so the tag says size 8, but it could either be considered a small size 8 or a bigger size 6