There are a lot of terms used when people are describing dressier jackets. For simplicity, the overcoat and topcoat are the most popular names used.
Overcoat, Topcoat, Greatcoat - Terminology Explained
Braveman Men's Wool Blend Herringbone Top Coat Overcoat Topcoat Jacket Black / Small
What is an Overcoat? Everything You Should Know - Hockerty
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Men's Topcoats - Express
Top Coats – Max Custom Tailor
Top Coats – Max Custom Tailor
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What is an Overcoat? Everything You Should Know - Hockerty
Post - The Measure