Related Clues:

• Sounds as if the knight is not minus what's extra
• The additional knight, by the sound of it, maybe spare
• Bit of frippery
• It's not necessary
• Superfluous extra
• Superfluous thing
• Showy extra
• Showy detail
• Extra something for the choir to wear, say?
• Maybe superfluous piece of adornment
• More than needed
• Unneeded extra amount
• Sour, loveless and redundant
• Gathered strip as a trimming
• Ornamental ruffle