dgt3
Don't stress, just be comfortable in your own skin! Don't feel you need to have lots of new clothes. For all you know other people may have felt overdressed and will dress down next week! I can't believe everyone else was perfectly groomed - this is just new girl jitters.

re. makeup - don't feel you need to wear a mask, in my experience other people are so concerned about themselves they haven't got time to be looking at other people.

Where I work a lot of people wear suits etc (which is just another type of uniform), but I prefer to wear cardigans rather than jackets so I wear these and I very rarely wear a suit.

Just have confidence in yourself. You sound a really nice, friendly person. If I was on the course, I would like to be your study buddy!
Good luck and let us know how things go!
Hugs Foxie x.