If you don't mind gambling, leathers can be had for $200 to $300 on E-Bay.
I have bought two sets of used Dainese race leathers that have passed SCTA scrutiny off of E-Bay with no issues.
My guess is Euro size 52 would fit you, but I would try some on to make sure.
Read the SCTA specs and make sure that they meet them.
Results may very, Don