The spaghetti-strap ruched midi lists four broad bust intervals but no waist or hip measurements. For a bodycon shape, a bust match alone cannot establish where the ruching sits or how the skirt fits when seated.

Read the two known columns

L lists length 102 cm and bust 74–96 cm, XL 104 and 78–100, 2XL 106 and 82–104, and 3XL 108 and 86–108. Adjacent bust intervals overlap heavily. Ask whether each interval is relaxed-to-stretched garment width or body guidance, and request photos of the tape at both endpoints. Compare a similarly fitted midi you can move in; never treat the top of an unexplained interval as guaranteed comfort.

Fill the missing fit worksheet

For two candidate sizes, ask for finished waist and widest hip circumferences, where those lines fall relative to the ruching, strap length and whether straps adjust. Request back-opening depth and closure details. Mark these points on the reference dress and check them while standing and sitting. Without them, moving to a larger bust row could change length yet leave the hip question unresolved.

Plan the visible layer

The source calls the dress backless and names polyester, but says nothing about lining, opacity or stretch recovery. Decide what underlayer, if any, you intend to show, then request rear and side images of the exact Black, Blue, Orange or Purple option. Measure the 102–108 cm hem from a confirmed origin with your footwear.