Formal attire within work based learning although a suit can be off putting to learners if you go on a shadow day. Shirt, tie and a jumper is good in this situation. That being said I have been on shadow days with people that look like they are going on a night out that eventually got the job.
Wear nothing, management wouldn't notice
Formal attire, preferably a suit.
Casual or smart
Always a suit and tie.
Shirt and tie
Suit and Tie