lol you are so British…
By the way – don’t bring toiletries. Unless you have some specific facial wash or whatever that you NEED. Except deodorant. Bring a lot of deodorant.
You don’t really need to bring school supplies – they’re cheaper there. Plus, they have A4 paper there, so don’t bring a binder or folders.
USBs are a good idea. Maybe even an external hard drive. I had to buy one there and it was wicked expensive. Also, as far as electronics go – if you’re from America, don’t bring a blow dryer/iron/sandwich maker/whatever. Yes, even if you have one of those useless transformers. Your appliances will still fry. Just mooch off *ahem* borrow them from your European friends. 🙂
Don’t waste too much space on hangers unless you know how much hanging space you’re getting – most seminaries have more drawer/shelf space, so they might be a waste of space.
Basically, rule of thumb – if you can buy it in E”Y, don’t pack it. It’s probably cheaper there too.
As for Shabbos attire in BYA/MR/BS – you wear Shabbos clothing. (What else would you wear?)