Those of you who know Doug Bradford, probably know that every year he encourages cavers to attend his birthday trip with a slightly elevated sense of style :)
For his 80th birthday quite a few well dressed cavers turned up.
video: http://captnemo.smugmug.com/Video/CaptNemos-videos/
Pics http://captnemo.smugmug.com/Caving/California-/Crystal-Palace-2015/
youtube video(incase the other one doesn't play for you: https://www.youtube.com/channel/UC6VdtGNIYS0ZwFtYtDd9PXA