In my day, we only had subligars to use as a speedo.
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If they worried about this, then you wouldn't be able to dye clothes to match skin tone at all. My static's scholar is a male Miqo'te with his pants dyed to almost exactly match his chocolate-brown skin and his top glamoured with the Emperor's New Robe. He basically looks like he's running around with a pair of boots, a flowered hat, and no shame.
I want the plain and stripped speedo can be dyeable. When I dyed my coeurl speedo into red, it just turned into strawberry panties ._.