The oversized blue denim dress has an 81 cm shoulder and 23 cm sleeve on L, rising to 82 and 24 cm on XL. Those figures indicate a very low seam relative to a conventional shoulder, but they do not tell you the total neck-to-cuff reach by themselves.

Build a reach measurement from a reference dress

Lay out an oversized dress you like. Measure from the neckline across the dropped shoulder to the cuff, and compare the seam position in the listing’s worn image. Ask how its 81/23 cm figures were measured before simply adding them together; curved shoulder paths and seam endpoints may differ. L lists 150 cm bust and 122 cm length, XL 156 and 123. A 6 cm bust difference barely changes the hem, so size by desired volume first, then verify arm reach.

For styling, a narrow trouser or a close underlayer makes the oversized outer shape easier to read; a wide trouser creates an intentionally fuller outline. These are visual choices. The page names denim and long sleeves but gives no fiber blend, stretch, fabric weight or pocket detail. Those need confirmation if the dress will serve as an outer layer.