H&M conscious exclusive metallic Jacquard weave dress 8 fits 2-4 blogger fave

Beautiful vintage vibes with this metallic knit Jaccard dress from the H&M conscious exclusive collection size 8, but fits like a size 2–4. I would say the top boned corset area fits like a two while the hips and thighs fit like a size 4. There is no stretch to the dress - back zip and two side pockets with front slit. Lined. Dress looks like new condition with no visible signsof wear or damage. Not sure why the sizing runs so small Approximately 13.5 inches across waist 18 hips and 14 pit to pit and 39 inches from pit to lower hem