Possible Clues:

• Its tail may be tucked in
• Male garment worn with tie
• Garment whose name aptly ends with "t"
• ''Button-down'' garment
• Jersey and tie from Thirties
• It will often go over your head
• "Keep your __ on!"
• Tie-dyed garment, often
• Henley or button-down
• Sleeved garment