haha oh man, i joined MTS so i could comment about this mod, but it seems this is the answer!

by that i mean, when i go with my sims to high school, they dont put on their uniforms automatically. but the uniform is set as the career outfit i can make them change into, and when schools over they auto change back.

ah well, now i know why it isnt working at least

This mod doesn't add uniforms to the new EP's High School (Copperdale) it only adds it for the old rabbithole one we had.
However, it's interesting you mentioned it's set as their career outfit in the new High School. I'll have a look and see if it might be easy to make it automated too. The reason I haven't already is because another modder (more experience than) me is making a uniform mod that pretty much covers it all, so I don't see a point to do the same.

Which modder?

Lot51 it's called Fashion Authority.

thank you so much for this great mod!!

Thank you so much! I was looking for something like this. I mean I downloaded a school uniform type thing for sims to where as like everyday, but it got boring really quick. I don't mind that this doesn't work for the new hs, I never join my sim when they go, I send them alone due to a bug. Thank you again so much.