Possible Clues:

• Part of some school uniforms
• Band in the US is to drink with restraint
• Formal requirement to kiss, given relationship
• It may be looped
• Why one might get hot under the collar?
• Knotted garment (US)
• (American) item of clothing
• Suit accessory
• Often-stained piece of attire
• Cup match on the isthmus could be a formality