paillette

A small piece of metal or foil used in painting with enamel.

A spangle used to ornament a dress or costume.

A spangle or glittering piece of metal (or glass) forming a part of costume, either sewed to a garment or hanging with others in a bunch secured to a feather or in a similar position where it could move freely.

In enamel-painting, a bit of metal or colored foil.

Also papilette.

A sequin or spangle.