Wear the most comfortable but non-descript clothing you can.
It doesn't generally happen at internationals but there is always one nutter hell bent on a bit of aggro.
As for club football, back in the day I always felt safe enough wearing my shirt at Anfield and Goodison but would never have worn it in Leicester had I known what was in store, it was pretty frightening.
Thankfully there's none of that nonsense at rugby matches.
"My advice was well intentioned and based on bitter experience. When I wore mine I found it made me a target for half eaten pies thrown from the back of the stand."
What game are you going to? I wouldn't have thought you would have a problem. An England fan once tried to rip my Norn Iron scarf off me at Wembley but that was 30 years ago very much in the Neanderthal Age
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