John Conley,
GCGC has hosted the tournaments you mention in the 20th Century. GCGC exudes tradition.....everywhere.
It could be the motto of the club, and is taken very seriously.
Some of the clubs ranked ahead of GCGC in the tradition category don't come close if you're really talking about tradition seriously.
Jackets are required in all rooms in the clubhouse with the exception of the Locker room.
Shirts can be removed at the 4th hole and put back on by the 16th hole, but rarely is one seen doing this, and it's usually a younger guy who misunderstands "macho",
"golf", "tradition" and "taste". I think it's an aberation that should be eliminated. It is rare, but it does occur.
Brad Klein,
Ties aren't required, but many wear them with their jackets.
You can decide what to wear when you visit.