From The Free On-line Dictionary of Computing (19 January 2023):
suit
1. Ugly and uncomfortable "business clothing" often worn by
non-hackers. Invariably worn with a "tie", a strangulation
device that partially cuts off the blood supply to the brain.
It is thought that this explains much about the behaviour of
suit-wearers.
2. A person who habitually wears suits, as distinct from a
techie or hacker.
See loser, burble, management, Stupids, SNAFU
principle, and brain-damaged.
(1998-07-01)