Thanks jakki I don't have a waistcoat and since I am just doing it to socialise my youngster I was thinking a hacking jacket would be more useful as I could wear that to most other ridden things couldn't I?
If it's the coloured in your sig I would wear dark trousers and some short boots that are comfy for you to run in, looks nicer than long boots. I wear some cheapo dark brown joddie boots and Matalan £10 special dark trousers (also useful for nights out)!
Mine are a very dark chocolate brown - my welsh is a chestnut with flaxen legs, my coloured has white legs. I find black a bit too harsh. Get a tin of brown boot polish and revive the joddie boots - I use my old ones as I cannot run in new boots, they need to be worn in (scruffy) to be comfy!