Slim fit suits are what one associates with Italian or European cuts. These suits are fitted much closer to the body and don't utilize any extra fabric. The pants in a slim fit suit are straight-legged and fit the leg tightly. They typically sit below the waist.
A modern fit suit falls down the middle between a classic and slim fit. While it's not cut quite as close to the body as a slim fit, it's a tighter fit than a classic. The pants in a modern fit suit are straight legged, but with a more extra fabric than a slim fit pant.
A classic fit suit is recognizable in its liberal cut through the chest and waist, leaving the wearer with plenty of room for flexibility and comfort. This type is less constrictive than a slim or modern fit. The pants in a classic fit suit are regular fitted and sit on the waistline.
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