Clothing conversion - UK to european size?

[ann_of_loxley]

Want to buy some tights for DS from germany (they have the coolest tights for boys! hehe)...keeps his legs warm in the winter you see.

His UK size is 3-4 years...
So what is that in european size? Thanks! :

[Sadystar]

European kids sizes normally refer to height in cm, so it really depends on him, e.g. my daughter is 2 and tall, I usually buy her 98 but often times this translates to a 3/4 in UK shops! Perhaps some of the clothes that he has have the european size on the label too? When I was over I noticed this in Gap, H&M and Zara. I think an average 3 yo is "supposed" to be a 98 or 104 (?).