Founded by Sarah Rashid, Symmetry produce practical, but pretty scarves. They are designed to be "pin-free, button-able, convertible and non-slip". Check out their how-to videos to see just how they work:
Their hijabs are based on layering a colourful headband with a 'base' scarf, something I wear often myself, and did a blog post about here last year. I'm not fond of the way some of the scarves are styled without covering ears and neck properly, though that can be adjusted quite easily. I'm also not quite sure what to make of button-able hijabs! The company says that they are looking to branch into casualwear, formalwear and swimwear, and I'd be interested to see what they come up with!