Putting personal palette advice into practice

I am helping organize a community clothes swap and putting together a short note for people browsing the racks. The event welcomes all ages and a wide range of personal styles. Size labels are straightforward, while grouping donated clothes by flattering colors seems much harder to explain fairly. I would prefer a few questions people can ask themselves, without assigning anyone a season at the door. The resource I have been looking at for background is color analysis though I still need a sensible way to describe the limits of any quick assessment. Is a simple scarf comparison a reasonable activity when there is little time for individual advice? Daylight reaches part of the room, but I cannot promise identical conditions for every person who attends. I would appreciate examples of friendly wording that keeps the emphasis on experimenting with clothes people already own.