The Business Suit
When a suit absolutely has to be worn for the reason that lounge suits have typically be worn for the last 150 or so years – to connote and to gain respect – then it’s best to opt for the most classic kind of suit possible. Obviously, this changes over time – a suit from the 1980s tends to look like it does, no matter how timeless its creators set out for it to be. There is, nonetheless, a kind of generic suiting style, harder to pin to any specific period: consider a two-button single-breasted jacket with notch lapels and flapped pockets, nipped in at the waist, and of medium length (ending roughly in line with your knuckles, hands by your side).
Trousers should be flat-fronted and plain finished, medium width, with a medium to high rise. Add in a lapel-free waistcoat, if required. Opt for a medium to heavyweight all-wool cloth in navy or charcoal; herringbone or a similar understated pattern can help add subtle interest.