Weekday Clothes on Shabbos during the Nine Days

In Minhogei Worms it is stated clearly that on the Shabbos of the 2nd of Av, one wears Shabbos clothes, unlike Shabbos Chazzon.

Michael FRBSH

I asked Moreinu Harav Gans Shlota, and he told me there is a Halocho that one should not be Noheg differently than the people he is among because this can cause Machlokes. Therefore it is not recomended in such a case to wear clothes which are clearly weekday clothes.
But one does not have to wear his tie (even if he wears a tie on every Shabbos and does not wear a tie on weekdays), because this is not clearly weekday clothing, since some people do not wear ties on Shabbos, and sometimes people forget their ties etc.
Also, to wear one suit instead of the other (to wear ones weekday suit instead of his Shabbos suit) is OK too (on condition the weekday suit is also clean).

Michael

The Oruch Hashulchon is in Orach Chaim, Siman תקנ"א Seif י"א. He is not talking about Eretz Yisroel, he is talking about eastern Europe.
He comes to explain the reason that for many years the Minhag brought in the Remo that one should wear his weekday clothes on Shabbos Chazon was not practiced in Eastern Europe. What he explains is that in the time of the Remo the clothes on Shabbos and weekdays were similar, just that on weekdays one wore simple clothes and Shabbos the clothes were more expensive, but after that the style changed completely, and on Shabbos people wore a Shtreimel hat and silk clothes, and for that reason people considered it Aveilus Befarhesia. He concludes that since today one doesn't wear the Shtreimel and silk clothes any more (in Lithuania), and the difference between Shabbos and weekdays is that on Shabbos the clothes are more expensive than weekdays, one should wear weekday clothes on Shabbos Chazzon.

Michael