@Ryoga I'll check it out. Haven't logged in since before maintenance. It was working fine then. They might have broken something with the patch. I'll know for a certainty when my game boots up.
Edit: It doesn't work because it's not individual parts. They packaged them in boxes, likely to reduce the loot pool, so that you have an increased chance of getting the items you want. Clever, but it removed any ability to preview the item. Something OP didn't exactly specify well with the initial post ( or I misinterpreted what was posted with the wording provided). It sounded to me like someone didn't know how to preview individual parts in the preview window, not that the entire cast sets were being offered via the scratch as a full set. They might need to patch in the ability to view the full sets at a later date if they feel so inclined.