I'm looking at an RJ Classics coat that's a sort of crossover coat. It's black, four buttons on the front, but the back is double vented (with two buttons above the vent, go figure).
I've always been told that double vented coats are good for shorter people (which I am not) with small bums (which I don't have). However, this coat is as long as my current single-vented Equine Athletics coat, so I'm wondering if it'll cover enough of my butt/thighs so the aforementioned large bum won't be too obvious.
Part of me also wants to say single vent is "male"....but I don't think that's right, either.
It's not. Men's suit coats and military uniform blouses are tailored both ways. The country of origin seems to be more of the driver as most American coats are single vented and most English ones are double vented. But there are no absolutes.
Single vents are correct for any type of foxhunting, at least they used to be, and for what were called "hacking jackets" back in the old days. I grew up in the 1960s when all jackets had single vents. Double vents became the new fashion, and while I prefer them for myself, sometimes a single vent is more attractive on someone with a large behind, I think it really depends on your body type.
Decades ago most jackets were single vented, I believe mostly because tailors knew what flattered a lady's figure. Curved back seams and a single vent give a nice line and do not accentuate the, er,rear end. straight seams and a double vent do give that boxy look.
That being said, I do prefer curved back seams and a lower double vent, it's what works for my body type. Use current fashion and tradition as a guide but in the end go with what works for your body type.