Hello BonBonChoco, the shoes size means the foot size, so if your foot is 23.5cm, you can choose the 24cm or 25cm, it will fit you better. For the shoes width, if you've special request, you can write it in the Remark Box when you make the order, and our shoes tailor will adjust for you. n_n
**please check the 'how to Meyer?' chart under the ordering information. :)