The Old Glory sleeveless sweater has a muted flag pattern, notched crew neckline and loose, boxy knit. The source explicitly labels it sheer. Decide what you want visible underneath before choosing the size; sheerness changes the outfit plan even when chest measurements fit.

Choose the underlayer first

Try a top in a color and neckline you would be happy to see through a light knit. Compare its neck opening with the sweater’s notched neckline, and check whether its sleeves or straps would show through the armholes. The listing does not quantify opacity in different light or give armhole dimensions, so a product photograph cannot guarantee a particular coverage result. Ask for a photo over an underlayer similar to yours if visibility matters.

Test the size-down advice

The source calls the fit boxy and says one size down can create a slimmer look. The published S chest and length are 44 and 26 inches; XL is 50 and 27; 3XL is 56 and 28. Notice that from XL through 3XL the chest changes more than the length. Compare the row you are considering with a sleeveless knit you own, after confirming whether the listed chest values are body guidance or garment measures. Sizing down may alter underlayer clearance and armhole exposure, not merely the outline.

The fiber line is 60% acrylic and 40% nylon. The page does not specify a measured stretch range. Use the chart to shortlist a size, then check your chosen underlayer, shoulder placement and hem length as one outfit.