Ask a bluntish question, you'll get an interesting set of answers. You know why? Because it isn't a uniform.
This is what's important to me:
Pale blue cotton; navy wool and cashmere
Off white chinos or dark denim
Wind and weatherproof outerwear
Penny loafers
Lambswool or cashmere scarves
Falke socks
Navy, green or maroon polo shirts
Navy blue, bottle green, various shades of grey, maroon
Natural fibres
Not a full list but indicative.
white cotton, or checks on a white background
Hanes Ts
loafers in any manner of guises, longwings, suede chukkas
with you on the Falke, honourable mention for Wigwam crew socks too
dark denim, cords/trousers in the 'right' shades of grey, slim khakis
1960s sack jackets (know your size and buy blind)
Dacron, permanent press
lapels and ties no wider than 'four fingers wide'
^ Did Germany join the UK?
donner blitzen scheisse, ze cover is blown!