Some people think it’s a suit bought off-the-rack, then tailored to fit. Others believe it’s a suit made with your measurements, and a range of set options in the sleeves, lining, etc.
Suits become a part of our bodies, and as we move and sit throughout the day, they tend to wrinkle. A few occasional wrinkles that happen throughout the day are completely acceptable – you don’t need to press your clothes midday.