Mostly magazine spreads, professions that are not business related (e.g. academia), formal but not black-tie evenings, more fashion-forward or trendy business professions. The days three-piece suits were conservative business dress are very long gone. They are now more trendy than conservative.
I must be living on some different planet than you. While there may be a trend toward the three piece suit right now (and I'd argue it's actually about the vest itself, worn however) there's a huge difference between a man in a conservative three-piece suit and a man in a fashion-forward suit of any kind.