won't matter what you wear you will not stand out in London.The type of shoes you have shown are the sort i wear most of the time,The Columbia brand is quite common in the UK.

You could try these

http://tinyurl.com/cnncqgj

Oh wait a minute!! isn't that the exact same pair you looking at? For sale on Amazon.co. UK? Gosh!

OK, please take a little teasing from me Wear what the heck you are comfortable in because who knows you? Who do you expect will remember you 20 seconds after passing you in the street?

Take as many t-shirts as you can because you can easily wash them and they will take most of any sweating and will save you having to wash your hoodies/sweatshirts/fleeces on a regular basis.

This time next year, when you are long gone, do you think anyone will be talking about what you wore

I'd pack trousers with as many pockets as I could but, (sigh) I tend to drag a handbag around with me

Go, have fun, enjoy!

I would only say that UK students are much more likely to wear dark clothes than bright colors, that you are likely to need fewer T shirts and shorts than you would need in a spring semester in the US, and that you may need some kind of dress up clothes, depending on where you are studying.

Otherwise, people your age are more likely to want your clothes than put you down for not wearing clothes like theirs.

If you are mostly in the UK be aware that shorts are rarely needed due to the weather. Tee shirts are always good for layering.

A couple of things to note:

Indoor temps may well be lower than what you are used to so make sure you have something warm to sleep in (sweats or similar)

You need several pair of waterproofed shows or boots, since once they are wet you really can't wear them the next day. And I would think hiking type boots would be kind of heavy in the warmer weather - vs regular athletic shoes.

Also - determine if there will be any events that you will need a jacket and dress shirt for. Not suggesting a suit - but do look into any activities you will need something better than a sweater.

And in winter you can often get temps lower than 30 in Scotland, parts of England and northern and central europe as well as Switzerland. So be prepared for severe weather at times.

"If you are mostly in the UK be aware that shorts are rarely needed due to the weather."

I think you'll find at the first glimpse of sun, Union Jack shorts are de rigueur. The sights you see on a sunny day can take your breath away...