Possible Clues:

• Detachable shirtfront
• Detachable shirt collar
• Part of formal attire not in good condition
• It's a totally innocent *giggle* word for a detachable shirtfront *giggle*
• Tuxedo accessory
• False shirt front
• Detachable shirt front
• A tie in poor condition
• Faux collar
• Tell little Richard to take a back seat