I am 6'3" and weigh 215. I wear a 60 Euro(Dainese). I would prefer a 62 because with my knox back protector I have some room to move around. Most of the manufacturers have sizing charts but bear in mind they want them to fit snug so I always go up to the next size or so.
6'5" 320 here and i do play football. Best thing i ever did was get a suit made. It cost more but worth every penny. I than found a leather jacket in the UK that will fit me for days that i just want to go out in jeans.