dust·er 
(dŭstər)
(dŭstər)n.
1. One that dusts, especially:
a. A cloth or brush used to remove dust.
b. A device for sifting or scattering a powdered substance.
2.
a. A smock worn to protect one's clothing from dust.
b. A full-length coat, often slit up the back to the knees or waist, serving a similar purpose.
3.
a. A loose dress-length housecoat.
b. A light, loose, usually three-quarter-length top, often worn over a blouse or as part of a set with pants.