From
New Enough's site listing for an Alpinestars Leather jacket
Based on this, I take a Euro 58 for a good tight fit in a 48" chest. Thankfully, the belly is NOT 44" and I have plenty of room to "grow"
1st column is Euro Size
2nd column is Max Chest Size (inches)
3rd column is Max Belly Size (inches)
48 38 34
50 40 36
52 42 38
54 44 40
56 46 42
58 48 44
60 50 46
62 52 48
64 54 50