There is clearly a difference (I finally went and looked at the pictures from previous years) between what is expected of the men and the women at this event. Without a doubt, the men are dressed in black tie and for some reason the women are almost casual in some cases, but certainly not "black tie" level.

That being the case, I would not consider what the ladies will be wearing--they already "do not agree" with the men. This does pose a challenge to navigate the proper outfit...perhaps.

When I compare your own picture, Nathan, of you wearing the doublet with a black bow tie, I see it as more of a variation to the PC instead of a whole classification of difference. I would agree anything with lace might be over the top, but in this case, I still believe the doublet is appropriate. In fact, it might be greatly appreciated by several of the men to see something different. Most definitely it is likely to spark some excellent conversation.

I can not help but think that the gentleman advising you is INVESTED in your outfit (to some extent). If he is a sales person that rents a lot of gear, he wants everyone to look the same so he can rent them their outfits with what he has in stock! Perhaps he sees your wearing something different it as a threat to his business? I know that sounds a tad absurd, but I'm just trying to understand why someone would discourage an otherwise appropriate jacket to the event.

I DO think that a black argyle with tartan waistcoat would be FANTASTIC for this event. Far more conservative than the doublet (maybe) and closer in keeping with what appears to be the trend at this event, but personalized enough to avoid the cookie cutter look.

Whatever you decide, I am sure you will look great. I will be watching this thread to see what you ultimately decide and enjoy the discussion as well.