The story about Kogane High turned out to be false. Asahi Weekly put the release of K-ON! uniform and the introduction of new school uniform to Kogane High in the same paragraph, but the two stories are unrelated to each other. I retract the news and apologize for posting an incorrect topic.

The subheading reads "It Originated From Anime. Students and Teachers' Idea -Students' Will Takes Priority. It's Economical and Good For Descipline.-" but the phrase"Originated From Anime" is unrelated to the rest of the lines. I should have been cautious in handling such a low resolution scan.

According to Asahi Junior High Weekly, Chiba Prefectural Kogane High School adopted the uniform of K-ON!. The students of Kogane High hadn't worn uniforms but they decided to introduced one and K-ON! uniform was selected by the students' request. The teachers and the students are satisfied with the uniform because it's economical and made a good effect on the students' discipline of their appearance.

Scan of Asahi Junior High Weekly

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the story below are true.
Saitama Prefecture has also considered to adopt the uniforms of anime which relates to the area such as Lucky ☆ Star and Crayon Shin-chan.

Kyoto Newspaper reported that K-ON! fans have donated 758 items to the old building of Toyosato Elementary School, the model school of K-ON!. One of the classrooms of the old school is filled with such items from the tea cups to the drum set.

Scan of Kyoto Newspaper

The residents in Toyosato welcome K-ON! fans by establishing "Town Revitalization By K-ON! Committee". The chairman Miyagawa Hiroshi said "The sales of the local restaurants and the railway are increased by the visitors from all over the country. We want to raise the movement more."

Sources: Kogane High School official website, Japanimate

Related topic: "Keion" Live Concert Held At K-ON! Model School