My Grenfell trench-coat - made of Grenfell cloth - is very waterproof indeed. I don't know how good the more recent Grenfell coats are.I also have a Grenfell which is beautiful, every bit the equal of the Burberry, and bought on eBay for a fraction of what the Burberrys cost me owing to the name being that little bit less fashionable.
Strictly speaking, a Mac is not a style but a totally waterproof raincoat, of which the most stylish and most practical are tne double-texture riding-macs, single-breasted and belted. Unfortunately new ones are astronomically expensive. See earlier postings by nightandthe city on this.....I often find that here in London a SB Mac style (of which I have a couple) to be better suited to the warmer weather. Sort of the next step down from a covert coat in terms of weight. Burberry models of these are an excellent used buy - superb quality, and because they don't have the fashion cachet of the db trench, they come in at a tiny fraction of the new price.
The single-breasted style of raincoat to which you refer, with raglan sleeves and a fly-front, is by far the best summer coat for light rain, and in my opinion is an essential on our rainy island. (What is more, both a cap and a trilby/fedora look good with this coat.) You're absolutely right about the abundance and relatively low price of Burberrys of this style.
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