Check for one missing panel
Return to the inventory and mannequin and inspect every required panel. Build 410 shows a placement hint when you hover over a panel, which can reveal a piece that was cut but never attached or sewn.
Read every requirement separately
A green style target does not prove that all colour, material, trim, quantity, or construction requirements are complete. Check every line of the brief and make sure the game has registered it.
Save, leave, and reload once
Players have reported cut pieces reappearing after saving to the title screen and reloading. This is a community-reported workaround, not a guaranteed repair, and persistent cases should be reported with the save file and build number.
Know what Build 403 fixed
Build 403 fixed payment for a failed commission when the character accepts the dress. That does not mean an unfinished garment can always be submitted; it describes the payment outcome after acceptance.