@nblr @mbirth @cstross Huh. I posted an answer to that, first it showed up thrice, then upon deleting the newest one, all three copies disappeared.
Let's try this again.
Scanners/photocopiers trigger on histogram values, even with all EURions edited out. So the next step would be a shirt with a color pattern that recreates the histogram value of actual currency, maybe with one or more EURions sprinkled across it for good measure.

@nblr @mbirth @cstross As far as I know, a single anti-counterfeit pattern won't trigger the alert. Same goes for repetitions of said pattern. You need at least one *different* pattern in addition to the EURion(s) to trigger it.

@cstross I would pick anti-counterfeit markers like the EURion constellation (you'll need more than that, EURion alone doesn't trigger the alert) instead …