old school tie
- a necktie striped in the distinctive colors of any of the exclusive English public schools
- loyalties, traditions, attitudes, etc. of, or like those of, the graduates of such a school
See old school tie in American Heritage Dictionary 4
(ōldˈsko͞olˌ)
noun- A necktie that has the colors of a British public school.
- The upper-middle-class solidarity and system of mutual assistance attributed to alumni of British public schools.
- The narrow clannish attitudes characteristic of the members of a clique.