What is the rule of thumb for buying a used suit? What % of new would you pay?

I found a used suit that looks to be in good condition. What would you pay for a used suit, I was thinking 50% of the cost of new, but I have no idea what is reasonable. via /r/Trackdays https://www.reddit.com/r/Trackdays/comments/b5q26p/what_is_the_rule_of_thumb_for_buying_a_used_suit/?utm_source=ifttt