Is it the 'done thing' to wear a suit on your first day of a new job?
I want to make a good impression, but also don't want to looking like I'm trying too hard 
I have a lovely dark blue suit and smart white shirt which I wore to interview, I wear it with brown heels.
Other outfit options:
Plain black jersey dress, dressed up with nice jewellery/belt/possibly pearl collar + heels
Black cropped slim fit trousers and lovely blouse + loafers or heels + black jacket
What to wear?? I'm stressing about it a bit - probably am channelling too much thought into this so I don't have to think about everything else that stresses me out about a new job! 