The main problems could be wind chill factors and sitting still! If you wear warm windbreaking clothes and move about as much as it could be possible in the stands that might be more effective.
If you go for the quilt, maybe use a wool batting or two plus could find some light wind-breaking fabric like 'Grenfell Cloth for the backing I bet that would be snug and warm.
I bought a really warm jacket when I worked in Labrador - Grenfell Cloth is a very tight cotton weave usually in primary colours; you might have to get it from Northern Newfoundland or Labrador.
They may send swatches; it's easy to work with a little like denim but tighter weave. I haven't checked recently but it probably is quite expensive. After the Native traditions of beading and embroidering parkas and anoraks the ladies who make the jackets embroider a bit - usually an emblem on the upper left chest - I had a purple jacket with two white ptarmigan (like partridge) and her two chicks. Since I had two sons I though it would be nice symbolism to wear around.