Well, I think I'm about ready to start slowly building a good kit from scratch. My portrayal is a late 13th century Irish warrior, fighting in the skirmishes and battles associated with the English at the time.
I'll be engaged in SCA style fighting which has a few rules that I'll have to break for the sake of safety, but off the field I can be as period as I'm able to. So below is a list of what I want to do with the research that I've done, but there are gaps that I just don't have any info to go on, so some of these are guesses.
Leine - Relatively form fitting, especially in the sleeves, almost always long sleeved and made from linen. The length varies over the centuries and this is one of those gaps I've found. Other cultures show tunics growing shorter as time passes, and the evidence from later Irish artwork is no different. My guess is that there was still variation in the length at this time, perhaps from as low as just below the knee to as high as the middle/upper thigh. Likely I'll have a shorter one on while fighting.
Ionar - Similar to the leine, but made of wool and less form fitting so as to fit over it. I would guess that this also varies in length and would be comparable to the leine at any given time.
Inar - I'm not really sure if these still exist as such by the 14th century. Any help is welcome here.
Brat - Wool cloak as long as my height (6'0"). Not sure about the width... I'd guess 3/4 my height, so 4' wide by 6' tall and secured with a brooch.
Brooches/Fasteners - I'm kind of stuck on this one. Are we still in the pentangular brooch era or have we moved on from here? I know the brat is secured by a brooch. What bout the other garments?
Trius/Trousers - On the field, I'll have to wear baggy pants down to my ankles to accommodate my leg armor, which is an in-line hockey girdle with leather inserts over the padding (I'm going for mostly hidden armor). Off the field, I have no idea what leg wear I'd be using or what material would be appropriate.
Shoes - Again, on the field I'll wear comfortable boots that I'll disguise as I'm able. Off the field, likely a short, leather shoe of some kind. Links and descriptions would be appreciated.
That's where I'm at right now. I've got a picture in my head and I'm just hoping that I'm on the right track and not totally wrong about everything I've just put up.
Cheers!

