How does Chanel shoe sizing run?

This summer I bought 3 chanel sandals. I am a true 6.5.

In the wedges I went to a 7 but my friend who is also a 6.5 went up to a 7.5.

In the camilla sandals - the jelly ones - I went up to a 7 but they still feel a little short.

In the CC flats with the large double C's on the top - I bought a 6.5 but I think I should have bought a 7 but it was unavailable.

I hope this helps!!
 
Can anyone please tell me how Channel shoe sizing works. I'm a UK 3, US 6, and EU 36. This style pic (Google images) attached below. I have shoes which range from UK 3 to UK 4.
Thank you all for your replies and help is much appreciated.:smile:
 

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I have the ones you are referencing, and I found them to also run tts. I took a 40 in these, while I take a 40.5 in CL Declics (a style I see in your signature). Given that the straps keep my feet secure in the Chanels, I may have been able to do a 40.5 easily.