Flapper Dress and Matching Slip, size6/8

EUC This is my dress and I’ve had it for about 15 years. I only wore it to a handful of parties - still, it’s a very delicate garment and a few beads might be missing - but that’s about it. I believe it is size 6 or 8, in other words, a Medium. PTP measurement lying flat is 16.5, however it easily stretches to over 20”. I bought the dress in Italy and it might be Alberta Feretti or BLUMARINE. I simply don’t remember. (The pictures of the matching slip and a video are coming tomorrow).