This red strapless corset top lists both front buttons and front lacing. Those are different closure details, and the listing does not show their adjustment range or provide a size chart. Before choosing S, M or L, identify in the selected item’s photos which part actually opens, which part tightens, and whether the lace is decorative or load-bearing.

Check the closure sequence

Ask for a front photo with the garment open and another fully fastened. If the buttons close first, ask how much gap the lacing can then take up; if the lace closes the panels, ask for the minimum and maximum comfortable garment circumference. Measure your own bust and underbust at the intended wearing position and compare those figures only with finished garment measurements supplied for the exact size. There are none in the current text, so copying your normal dress size would be a guess.

The source names lace details, a strapless cut and a polyester-spandex blend. It does not document boning, support level, lining, pad construction, stretch percentage or a method for keeping the top in place. A jacket worn open could frame the red front detail, but it cannot answer the fit and closure questions. Request those details rather than assuming “corset” guarantees structure or support.