Blazer -> fancy
We used to wear blazers as part of our uniform in Highschool.
On Mondays - Boys: Formals, grey long pants, white shirt (long or short sleeve, I always wore short sleeve) school tie, brown "Grasshopper" shoes (a brand here in South Africa) and the school blazer.
Tuesdays to Fridays in first and fourth term - Summers, khaki shorts and shirt, long school socks, brown grasshopper shoes, schools tie and blazer.
And for certain days and events we had "Special summers". Khaki shorts, white shirt, school tie, long socks, brown grasshoppers, and the blazer.
I liked the school uniform, it meant that everyone was dressed the same and kids were not judged on how much money their outfit cost..