I've worn both entirely custom-made suits and off-the-rack ones. All suits I've ever worn have the same problem - the standard sorts of fabric/design that everyone recommends for "a dark suit" is too hot and doesn't breathe enough so you tend to get all sweaty and gross and want to get out of the suit as soon as possible, regardless of how well it fits. In the summer, it's too hot outside to wear a suit; in the winter, it's too hot inside to wear one. Hence: inherently uncomfortable. Maybe if you wear one long enough you just learn to get used to it?
