Here is some info about different brands shoesizes that manufacturers have informed about their shoesizes.

First of all, in our system, we are using UK/EU sizing, the first number (in this case UK) tells what is the size the manufacturer have told their size in. Second one is our own conversion to the other measuring unit, and it is not necessarily exactly right, it is just for your convenience that we are giving some reference to what that size is with about accuracy. Different Brands use different conversion rate, and hence we cant give you exact conversion size.

example:

UK 5 / EU 38 - means that manufacturer have declared the shoe to be of size UK 5 and second number, EU 38, is only our own conversion of the number (Not official from manufacturer) put there only for your convenience, and hence the second number might not be exactly right.

BRAND and their SIZES as told by manufacturers:

GABOR: (this is also upon which our size conversion from UK to EU is based upon)

http://www.gabor.de/en/company/service/shoe-sizes/

HÖGL: (following sizes read alongside their UK size in their shoeboxes)

we also recommend you to check Wikipedia page about shoe size