Are you more interested in the printing technique or the use of metallic acrylics? I rarely use large doses of metallic paints or inks, but I print often (on papers and fabrics) and use a lot of items to transfer a design...wood blocks, lino blocks, stamps of all types (rubber stamps, carved erasers, foam rubber, kitchen tools, plants, found objects, food, anything at all is worth trying).
Some tips: Spread the paint on the block with a brayer, not a foam brush, to better ensure it stays out of the low spots and have a slightly padded surface under your fabric when you print to give you a crisper image. A layer of thin batting or an old mousepad works well.
You can print on textiles using dyes or inks as well as paints, and depending on the preparation and aftercare, all can be made permanant and washable. There is a wealth of information available about block printing on fabrics. Have fun!!