Handle9:
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My old high school has a generic uniform outside the school jersey and PE uniform. Navy shirt, navy shorts, black long socks and black shoes.
Given it's one of the most prestigious schools in the country it suggests that it's possible to have a school with a uniform that isn't branded up the wazoo.
Sounds like we may have gone to the same school (though, I thought our school shorts were black so maybe not - I went to Auckland Grammar).
We had to have a navy shirt (not a polo, a button up) and black shorts, black socks (with garters, or just insulation tape, to hold them up) and black leather shoes. This was nearly 40 years ago. School Jersey was the only branded thing, and IU only ever had one new one (rest were second hand). Did have to get a blazer when I was in a rep sports team, and a white shirt and school tie.