Decathlon/fouganza sizing help

I can only do what you've done and tell you my comparison to normal sizes. I'm normally a size 14 on the bottom although sometimes I wear a 12 but they tend to be older trousers that I've had for a while. My Rhinegold jods are a 28 long and I do have a pair of Harry Hall 30s that only fit just after they've been washed - then they go baggy! My two pairs of Decathlon breeches and the pair of jods I have are all 'medium'. Hope this helps.
 
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