A well fitted crombie/covert coat will conceal an expanding girth, a poorly fitted one will accentuate it. It's stylish but not very versatile
In an increasingly wet climate, and being wool - even felted wool, it will absorb water. It’s time consuming to dry because you can’t expose it to heat. A macintosh with a removable quilted liner might be a more practical alternative if you’re looking to invest in one smart coat.
A mac is longer, finishing below the knee, and you’ll get four season protection from wind and rain in addition to masking your paunch. Plus it buttons to the neck so you won’t have to carry a scarf during the winter. It’s more forgiving if you wear casual clothes, looking equally good when paired with a suit, jeans and boots or even with jogging bottoms and trainers. That would look a bit extreme in a formal overcoat with notched lapels. Unless you want to make a statement and accessorise it with cherry red DMs and white paracord ladder laces.