> what is the name of this long version?
That long version are called "長ラン"(chou-ran). "長"(chou) means long(version), "ラン"(ran) comes from オランダ(Holland - 和蘭).
During the Edo era, among the Western people, only the Dutch were allowed to come to Japan. So Western clothes generally were called 蘭服(ran-puku) or ランダ(randa-->slang, jargon or colloquial expression of ran-puku) for a certain time after the Meiji Restoration. And school uniforms / clothes for students(学生 - gakusei) created in the Meiji era were called "学ラン"(gaku-ran<--- gakusei no randa).
> Are they also used as school uniforms?
A type of bad boys(girls) wear them. They hate normal uniforms, and buy "customized" versions at "specialized" shops(or get them from their senpais). I think this type of kids are on the verge of extinction in these days, but google shows some links of such shops.
変形学生服・学ラン｜変形学生服・特攻服の通販【コーソ】
応援団服｜変形学生服・特攻服の通販【コーソ】
http://www.netyokocho.jp/kanematu/goods/D130/
http://www.gakuran.jp/database/database.cgi?cmd=s&sc=j1
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