So, the Y which is the abbreviation for my company ( ym&ywha ) is a jewish establishment, although it is friendly to everyone regardless. The way you dress doesn’t matter as long as you dress for the job you have and comfortably, so in the long run I would say informal. The company have offices and they are quite open so you can see and hear other employees work as you do. When I finish work at the school with children, I go upstairs and start working on my internship, which makes timing easy for me on a daily basis.