Answer:
Your shirt will appear black
Step-by-step explanation:
When you are wearing a red shirt, only red light from molecules scattering in the air. The naked eye can only see the color of the shirt if the color light reflects off the object, in this scenario red light is the only bounces off the red shirt giving the shirt a color of redness to the human eye. When blue light is only presented in the room with the red shirt, the blue light will bounce off the red shirt. The shirt wouldn't be red anymore, and appear black. This happens because the blue is absorbed no red light is remaining to go on the shirt.
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