Ads posted recently in ultra-Orthodox areas in Jerusalem quote prominent Ashkenazi Rabbi Chaim Kanievsky as saying that men who "intentionally" wear tight pants will be subject to ostracism.
The ads were distributed as part of a campaign launched several months ago in regards to standards of modesty in men's clothing. The campaign's highlight was the ban on tight pants, which were defined as a serious Torah prohibition and a "gentile practice."
According to the campaign managers, anyone wearing close-fitting trousers is violating the prohibition "Do not follow their practices" (Leviticus 18:3).
In addition, according to the campaign initiators, wearing tight pants emphasizes the shape of one's body, which may entice women.
In order to make the desired wardrobe clear to the haredi public, the ad included pictures of rabbis wearing wide pants.
Another front launched by the campaign was against short suits which fail to cover the entire upper part of one's body.