Investing in items in between seasons is always a bit risky because you don't know how long you'll actually be able to wear them for, especially with unpredictable British weather. Therefore, when shopping at the moment you need to think carefully about your purchases and tailored shorts could be a great investment buy.
You can wear them now with shorts and a piece of knitwear, then in the warmer months you can team with a printed tee and sandals. I particularly like this pair by Givenchy (£410) which remind me of a pair Alexa Chung has been sporting. Topshop offer a much more affordable pair (£30).
The high waist shape makes them more flattering as it lengthens your legs, it also avoids any "muffin top" misdemeanors!