I don't LARP, but I do Ren Faires I made a totally functional "men's" outfit. I imagine that it would be really comfortable to fight in and you could make a matching circle/half-circle cape in lieu of a tabbard. I think that the circle cape is was more kicky. Can be used as a parry weapon too.
The doublet and breeches are from here: http://www.margospatterns.com/
, though it would be easy to adapt a different pattern.
The breeches are just modified men's pants, with a lot added to the seat, to accommodate my booty. The doublet is a combination of the men's doublet and the lady's doublet. The lady's doublet is meant to be worn over a corset, which negated the costume's purpose of comfort.
You could sub Simplicity 3782 for the doublet, though I imagine you'll want to make a mock up and any pants pattern will work for breeches. All you'll have to do is shorten them and add a cuff.
I also like www.sockdreams.com
knee high cotton striped socks. They come in a ton of color combinations.