I picked up three clothes brushes at a thrift store. Â Two appear to be natural bristle (pigs?) with one of them embossed with the store name "Blauner's Women's Outfitters" at 9th and Market here in Philly. Â It looks pretty old and is slightly more stiff than the smaller brush I've used for years. Â The third brush is from Briton Brush Cov Ltd. and is embossed "Bristle, Fibre & Bone 1944" Â It's stiffer, still than the Blauner's and the bone bristles are readily identifiable and comprise about 20% of the bristles. Â Anyone know anything about bone bristles? Â I'm concerned they may be too stiff for today's wool clothing. Back in the 1940's fabric was heavier.