Yeah, you have to leave the bunker and wait a few days, then go back and ask to join the BoS. He will give a suit of T45d with the helmet and teach you how to wear it.
For those of us that have waited for days and weeks and still do not trigger the trial here is a thread about a possible order bug and work around. I'm going to give this a shot, but will take me a while to see if it works due to my save point. What a pain in the [censored]....
http://www.gamesas.com/index.php?/topic/1129721-really-need-help/page__gopid__16576992