Your general uniform you wear is your utilities year round. On Fridays, its pretty much standard to wear your working blues or working whites, depending on the time of the year. The exception to that is if you have a lab that requires steel toed boots, which will force your class to be in utilities that Friday.
If your class gets on ordered quiet (gets in trouble) you wear your working whites/blues the whole day all week, which can get annoying.
The mechanics A school class night study watch is to be in working whites/blues, unless there is a specific exception authorized by your SLPO allowing the NSW to wear utilities. EM/ET A school and Power School NSWs must be in utilities, unless they've POd their SLPO and have to stand watch in uniform of the day.
When there's a power school graduation, everybody is in dress whites/blues, except those working on T-Track BMO, BPO, or perimeter. If you're on watch on T-Track, its working whites/blues and that damned dixie cup hat indoors as well. Also, if your class has a lab that requires steel toed boots on that graduation day, you will be in utilities.
E4 and up can wear civilian clothes inside of the building for night study after 1630.
Every few weeks in A school you will stand an inspection in a various uniform, those usually fall on Fridays, so you may be in your dress blues/whites for no reason at all except to get inspected.
Confusing?