A very dark shade of blue.  It first got it's name in 1749 from the British Royal Navy which used the color in contrast with white for their uniforms.

Many police use navy for their uniforms because the color conveys confidence and security without being threatening.  Make your own police halloween costume from our navy PVC / PU vinyl fabric:

http://www.mjtrends.com/products.Navy,PVC,Fabric

Small lightweight items or tools for use in sewing, such as needles, buttons, and thread, drawstring, scissors, or rotary cutters.  MJTrends has a wide assortment of sewing notions to assist you with whatever project you may undertake.

• Drawstring: http://www.mjtrends.com/categories-Drawstring,Notions
• Plastic Zippers: http://www.mjtrends.com/categories-Plastic-Zippers,Notions
• Brass Zippers: http://www.mjtrends.com/categories-Brass-Zippers,Notions