The phrase "a custom that is" is correct and usable in written English.
It can be used when describing a specific tradition or practice that exists or is recognized in a particular context.
Example: "In many cultures, a custom that is observed during the New Year is to share meals with family and friends."
Alternatives: "a tradition that is" or "a practice that is".
A local minhag (minhag ha-makom) is a custom that is binding upon a specific Jewish community.
They mean moving in with his parents, grandparents and siblings, a custom that is still the norm, even in prosperous families.
The passage more honored in the breach than the observance, from "Hamlet," refers to a custom that is more honorably ignored than followed — not one that is more often ignored.
Shopping on the Friday after Thanksgiving, a custom that is tradition to some and puzzling to others, got a new twist this year with several stores opening as early as 9 p.m. on Thanksgiving Day.
Qom even has its own well-known red-light district, where pious mullahs can get licences to be married just for a few hours or a day to a pretty woman in a custom that is close to abetting prostitution.Still, many young Qomsters feel suffocated and head north to breathe more freely and to look for work in Tehran.
This is a custom that is followed everywhere.
As late as the 1960s, even the sand in Chicago was segregated, not by law, but by a custom that was sometimes enforced by violence.
It's a custom that's been lost in Spain and I'm pushin for a comeback.
ʿādah, (Arabic: "custom"), in Islāmic law, a local custom that is given a particular consideration by judicial authorities even when it conflicts with some principle of canon law (Sharīʿah); in Indonesia it is known as adat, in North Africa it is ʿurf, and in East Africa, dustūr.
Bill placed it on the wall back of the bar and thereafter kept a hooded electric light burning above it, a pious custom that is still observed.
A long-ago holiday custom that is now illegal was called "Une loterie d'amour," where single men and women would enter houses that faced opposite each other for the purpose of pairing off.
