The joining instructions I got ahold of wanted dress pants, dress shoes, and a dress shirt, preferably with tie, and maybe even jacket.. I showed up in dress pants with a golf shirt, figuring I might get yelled at a bit but it wouldn't be a big deal.. When I got there people were showing up in sandals, tank tops and surf shorts. Apparently the dress code isn't enforced much anymore (others may have different experiences however). And if you're leaving St Jean at 330am for a flight, there won't be anyone around to see what you look like anyways.