Possible Clues:

• Brown knight going to work in a sleeveless garment
• Woollen sleeveless jumper
• Item casually assumed to be lid for water container
• Perhaps Churchill's most important garment
• Warm garment for turret?
• Fail to pick originally knitted garment
• Upper garment in basin, also cap
• Sleeveless option
• Bit of summer wear
• K.NGSLEY garment