In a case like this, where the actor’s shirt is red, it makes it less easy to see the red stage blood hit. I suggest you rig the hit using talcum powder, and this will pass between the fibres of a thin shirt, still making it look like a bullet struck the actor. As when rigging a “blood hit” it is just as easy to wash the shirt and re-use it. In other words, the shirt is not damaged.
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