The corduroy button-front pinafore has thick cami straps, side pockets, a belt and a full midi skirt. Those parts make the inner layer a real sizing choice. Before using the S–XL chart, pick the top you will most often put underneath and measure a pinafore or sleeveless dress you already own over that top.

Compare three inner layers

Fitted tee: check whether its neckline remains visible inside the thick straps and whether the armholes clear the sleeve edge. Collared blouse: check how its collar sits behind the straps and whether its sleeves add bulk at the side. Fine knit: check the combined chest and waist room, especially when the belt is fastened. These are outfit planning examples, not wear tests of this dress.

Keep the belt and button front separate

The source identifies a button-up front and belted waist but does not say whether the belt is removable, how long it is, or how closely the buttons are spaced. Ask for a flat photo of the closure and belt, and for the chest and waist of the finished dress. A belt may change the outline, but it cannot create extra space at the chest or underneath an inner layer.

Read the chart against your chosen top

S is listed as 32 in chest, 27 in waist and 42 in length; XL is 36.5, 31.5 and 42 in. The same length is printed across these endpoints while chest and waist rise by 4.5 in. Compare the dress you own with the planned inner layer, then ask whether the published figures are body or garment measurements. The listing does not give fiber composition, lining, button gaps or care instructions, so confirm those if they affect the outfit.