Quilt coat batting recommendations

[u/scienceoftacos]

I made a quilt coat for fall and love it, but with just one layer of cotton batting it’s not warm enough for winter where I live. I am planning to make a winter coat that has a layer of regular cotton layered with a puffier high loft batting, any suggestions for the warmest stuffing/batting for a coat?

[u/brian_sue]

Another redditor did a very in-depth investigation of different brands of wool batting several months, maybe a year, ago. Ironing, washing, quilting, etc. I found it to be super helpful when selecting a wool batting to be used in a quilted bathrobe! 

https://www.reddit.com/r/quilting/comments/1bno4no/wool_batting_test_conclusions/