Personally, I'd go with SC's suggestions.
I tend not to trust commercial patterns, as they don't often have sources.
And you can always scale up paterns from books on a photocopier, then just alter to fit.
The reconstructing history patterns look ok to me, but no more than that, and they have a "costumey" (rather than a "clothingy") look that I always try to avoid.
That said, that's entirely based on the pictures on the website, and it could purely be that the person who designed the covers can't draw very well!!
And they do get a good write up on the great pattern review http://www.gbacg.org/Patterns/rh.htm
While the organizer says that he can provide clothing, the prospect of wearing someone else's linens is not one that excites me, and I noted at the time that he did not say "We can provide clothing that fits."
If ECWS or SK (or really anything related), I can confirm that clothing is unlikely to fit (the breeches I borrowed at my first even were the same age as me, and twice as big as me (and tied up with string).
Do bear in mind, though that in the 17th century, (for re-enactors at least), body linens are really only shirts and shifts - not many people wear drawers (equiv. to braies).
What's the event, just out of interest??
"What a lovely hat! But may I make one teensy suggestion? If it blows off, don't chase it."
RIP Edward the avatar cat.