Buy it, put in the truck of your car or store it at your friends houses, or at work, or at the neighbors, sneak it in bit by bit at night when DH is asleep, or when he isn't at home. Hide it in an obvious place where he would never look (under your bed, under your kid's beds), in the kitchen cabinets. Slowly put it in your sewing room and tell him "oh that, i've had that for years", start sewing as if you were possessed and keep a look out for guilds that are begging for material for charity projects they are doing and share.