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I would say size or reverse size order- that is what I will be doing- with the MOH taken out and put at the end. Not sure who comes first MOH or flower girl- I think u are correct. But you could do it anyway you like- if you want to put them in order of importance- do so- jsut dont say so!!
I believe you have the BMs first, then MOH, then FGs and RBs - then you.