We need help keeping warm.

[Sir. Kindle]

Quick $.02 - if you want to spend a little money, I love my silk long underwear.  It's not as bulky as thermals, and helps as a barrier.  I have a pair from www.wintersilks.com and I'm very happy with them with the few times I've had to break them out.  I even have silk glove liners to wear under my leather gauntlet gloves (and when I bike ride in early february!)

Thank you for the link. I've bookmarked it and will be buying some asap.

[gem]

I couldn't get the Good Orient/Secret Black Long Coat page to load at all, but I wanted to say... don't think of whatever you get in terms of "covering up" her outfit.  Think of it as being *part* of the garb--something she loves as much as any other part, and something she looks forward to it being cold enough to wear. 

ETA: I Googled "Secret Black Long Coat" and found a thumbnail of it (I think), for anyone else who can't get the site to work:

[Hoowil]

You could make her a quick simple cloak out of fleece.  it would be warm and fleece does not need any finishing seams. 

I make these for the kids somewhat often, but if you get a 60' fleece, you can make a half circle that would fit an adult pretty easy. Find the fleece on sale, and the entire thing, including a frog or clasp would run you probably less than $20. On top of that, they have SO many colors, and patterns (if you wanted one) that it would be easy to match just about anything. Putting it together, if you can mark out a circle take all of an hour, including attaching the clasp. Even faster if you use a brooch pin, or non-attached closer.

[Lady L]

Both of those coats are very pretty. The fabric says "brocade", but not if it's silk or polyester brocade. Polyester wouldn't be warm in cool weather and not cool in warm weather.

When you said "chilly" I wasn't thinking 62! We think 60 is perfect weather for wearing layers of garb, such as velveteen, leather and wool. We are getting snow now, the ground and cars are all white here in Minnesota. By the way, we keep our house inside temps around 60 all winter, so I wouldn't consider that cold at all.

[Sir. Kindle]

Both of those coats are very pretty. The fabric says "brocade", but not if it's silk or polyester brocade. Polyester wouldn't be warm in cool weather and not cool in warm weather.

When you said "chilly" I wasn't thinking 62! We think 60 is perfect weather for wearing layers of garb, such as velveteen, leather and wool. We are getting snow now, the ground and cars are all white here in Minnesota. By the way, we keep our house inside temps around 60 all winter, so I wouldn't consider that cold at all.

You are right, I don't think 62 is that bad at all, it's the afternoon/evening temperature, which they are now saying will get down to about 35, that worries us. For my wife, it started getting chilly between 2 and 3pm, which leaves 3 to 4 hours of faire time, where it will only get colder. That day, it only got down into the mid to high 40s, so we are quite worried that it will get too cold for her to manage.  In addition, they are calling for an increased wind chill, which will only make it colder.

Also, I'm pretty sure, at the price of the cheaper one, that it's polyester, though I'm not sure about the more expensive, longer coat. However, if we do end up getting the cheaper one, if it turns out to be warm, that would be great, but if it isn't, we aren't that worried. The nice thing about wearing long sleeves, or a coat, is that we can stack up lots more warmth underneath, where no one will see it.

Sir Kindle

[Dinobabe]

Not trying to be snarky but why not have separate outfits?  Hot weather vs. cold weather.  I have different options of what I want to wear depending on the weather (and how I am feeling!). 
And adding a jacket is PART of the outfit, not covering it up!
I love this one.  Especially at only $40!