I'm 22.5cm and the size 5 i got is a perfect fit. I haven't used it yet but i tested the pair. They're comfy and looks expnsive. Not slippery and light. I think they are perfect for casual outfits and may also be used for driving. I'm already eyeing for another pair from Oak. Thanks!
Order a bigger size, but their return policy is very convenient. Love the feels of this pair!