For many years, vents were either non-existent or extremely rare. Italy was the last country, at least amongst those amongst the Western fathers of haute couture, to accept vents. Right up to the 1990s, both single and double-breasted jackets were without them. In Anglo-Saxon countries, suit jackets normally have two very high vents which follow a very high, silhouetted waistline (giving the jacket the famous V shape which is known as the English drape). 
The single vent, which is less aesthetically pleasing, is always better in off-the-peg models all over the world. It is a relic from their origin as sports jackets, for horse-riding or hunting, or leisure pursuits in general.
Nowadays, jackets with vents have completely disappeared. Only the dinner jacket remains.

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