What is Summer Suit
Such suits have either half lining or no lining. This makes the jacket ultra light and allows far higher degree of air and moisture ventilation.
Unlined or half-lined jackets usually are more expensive than the fully lined ones. It is because the absence of lining exposes all the seams and trims. So it becomes important that the finishing of those is done in a far more detailed and robust manner.
So go for one or maybe two. these will brighten your wardrobe and make your summers equally sophisticated as your winters are...