A small band or narrow strip.
From 'band' (a strip or fastening) plus the diminutive suffix '-let' (meaning 'small'). The '-let' suffix comes from Old French and Old English, used to create words for smaller versions of things.
The '-let' suffix is how English gets adorable shrinking words: droplet, booklet, piglet, ballet! It originally came from French but got fully adopted into English, letting us instantly understand that a 'bandlet' is a teensy band.
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