The phrase "a curious practice" is correct and usable in written English.
It can be used to describe a behavior or custom that is unusual or intriguing in some way.
Example: "In some cultures, it is a curious practice to celebrate the harvest with a festival that includes dancing and feasting."
Alternatives: "an interesting custom" or "a peculiar tradition".
In Kyōto, political authority was still further diffused by the introduction in the 11th century of a curious practice known as insei ("cloistered rule").
In the months leading up to her murder, relatives noticed Matthews had begun a curious practice of leaping out at Becky to scare her.
Instead, we have a curious practice in this country of hiding behind pieces of paper when confronted with moral dilemmas.
Simon Winchester, in an otherwise thoughtful piece in the Times Book Review, opened by describing a curious sexual practice involving butterflies, a friend of his, and "a sweet-smelling unguent".
Seventy-two years later, Borys published an account of life with his eccentric father in a biography-cum-memoir which uniquely exemplifies the curious practice of filial writing.
In "Christmas Eve," Irving specifically mentions the curious practice of hanging mistletoe, so odd that it required a footnote to explain to his American readers: "The mistletoe is still hung up in farmhouses and kitchens at Christmas; and the young men have the privilege of kissing the girls under it, plucking each time a berry from the bush.
That curious practice is widespread in Alabama trial courts.
Rami Aysha was investigating Hezbollah's curious practice of selling arms to the Syrian rebels despite sending fighters to aid the side of Assad when he was kidnapped at gunpoint.
Users spend their fantasy "lunch money" to "own" other members or celebrities, a curious but popular practice.
The evidence is clear; the question is how the West should respond.So far, there has been a curious inversion of past practice.
The connection between skating and having an art practice is a curious match made in creative heaven.
