Possible Clues:

• Like some expensive shoes
• Having mixed colours
• Like some British police sirens
• Having dual shades
• Colored like some cars
• 'Red and purple' describing hooter?
• Like many '50s cars
• Colour scheme that's not quite 2,000 kg, but more than 40 cwt
• Sporting a pair of shades?
• Reverse 28 down around first turquoise colour scheme