The pale blue full skirt occupies much of this image, with a decorated V-shaped bodice and a sheer-looking section around the waist above it. Thin straps create a delicate upper line. The dress is photographed with its skirt spread sideways; that arrangement demonstrates width but does not show how the layers settle during ordinary walking.
As a guest, compare the whole pale silhouette with the hosts’ preferences. A light blue name alone does not establish that the dress will look sufficiently different from the bridal outfit. If it is a serious option, view the actual shade in daylight and ask about any uncertainty while there is still time to choose another design.
Coverage requires a separate inspection. Look at the real lining around the waist and neckline rather than assuming the photograph shows the garment exactly as it will be supplied. Try your planned underlayers and a ceremony jacket without pulling the upper section into place. A calmer bag can keep attention on the bodice, but it cannot solve an unwanted area of exposure; that decision belongs at the fitting.