The leather slide camera wrist strap by Harber London is a great mix of simplicity and style.

Handcrafted in Spain using full-grain vegetable-tanned cowhide leather, this easily adjustable strap sports end lugs that make it equally easy to remove/change, which comes in extra handy since it's reversible between black and brown colors. To adjust the strap, simply slide it to whichever length is most comfortable for you. Works for all kinds of cameras: DSLR, SLR, mirrorless, etc.

Get the strap for £49 (~$67 USD) at Harber London. (You can also check out their other camera strap styles.)