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Bit of a dredge but the Knox armoured undershirt stuff, do you mean these: https://www.planet-knox.com/product/urbane-pro-shirt-mk2/
Is your thinking to just wear this over a bamboo vest and then layer up with any old casual shirt/hoodie/ball gown to complete the look? I’m after a new summer jacket and this looks like a viable system for getting shoulder and elbow cover on warmer rides. Especially if i move to regularly wearing an airbag vest to protect the squidgy parts.
If I was starting buying gear again for normal road riding I'd look at a Knox armored undersuit or one of the other brands. Gives you a lot more flexibility adding layers depending on where you're going/time of year etc.