My favorite is the Grandmaster Wolven gear. It's a medium tier armor. It's School of the Wolf, so it fits with Geralt's style. Geralt is a monster hunter, so he shouldn't be too kitted out. He still has to be able to move around. It maintains some spiked decor and spikes on the greaves. I imagine those could come in handy during a fight. Also, I like the chainmail jacket over the gambeson portion.
Additionally, I like to keep Geralt with short hair and with the Professor's glasses. Why? I like the glasses and they are like a trophy to me. Sort of like Boba Fett's Woookie pelts.
Also, I keep Geralt clean shaven because he hates beards.