I think you can only wear so many clothes with a certain bonus otherwise not all them will be applied. A couple of days ago I wore 4 items with viral damage and did less damage than wearing 3 lol. I don't think it was after I died, but I can try it again and see if I have the same results. The last item I put on had a 1% bonus which somehow must have taken priority over one of my 2 or 3% ones.
MrMatador