i wash! gotta ...... the sizing makes red, itchy spots on my wrists, arms, then my neck or face, etc. always put a cuppa white vinegar in that wash to set the colors - i had a navy blue bleed a coupla months ago when i forgot to do that! had to go back to the lqs to replace some of the other fabrics that ended up with a blue haze. :(
it's the batting that shrinks a tiny bit; i otta wash that, too.