Give me your tips and guidelines you follow when shopping for a wool coat- Double faced vs lined? Brands that excel in wool?

What are some key guidelines to follow when shopping for a wool coat?

What percent and composition of wool do you prefer? Do you prefer double-faced or lined coats, in terms of warmth, structure, longevity, and overall wear? Favorite brands that consistently do wool coats well?

There are so many types of wool coats out there and so many factors to consider, so I’d really appreciate hearing your advice, experiences, and recommendations.