Covered in or smelling like sawdust, which is the tiny pieces of wood that come from cutting wood with a saw.
Sawdusty things can make people think of construction, woodworking, or being in a workshop.
Examples:
The sawdusty floor made my shoes dirty.
The sawdusty smell filled the room.
The sawdusty wood was all over the floor.
I don't like the sawdusty feeling on my hands.
The whole room was so sawdusty, it looked like a sawdust storm had happened!
The sawdusty smell reminded me of my grandpa's workshop.