I'm surprised by the assertions here, and elsewhere, about space given depending on how you're dressed. I've really thought about this and the only time I notice significantly more space is when it's dark, I'm being overtaken, and the driver is contending with my vast array of rear lights, reflectives, etc. I can only think that they have no idea of the start and end points of my 'vehicle' and so err on the side of caution. As soon as they can see then their driving 'skills' allow them to action the skim manouever.
My experience on my usual roads, ie fast country, is that the majority of drivers treat you well. My anticipation has so far covered me for the dopey ones. The minority of nutters are just that and I'm not convinced I can wear anything to discourage them. My only weapon is road position and that varies from totally dominant to off on the verge, depending on how irrational the driver is.
Though Arch has a high viz vest with POLITE on the back done to resemble a POLICE vest. I really fancy one of those, I reckon that could be pretty effective.