There are many different types of kimono for men. The very informal type is called Yukata. It is made of cotton and worn mainly to Festivals/Matsuri, or relaxing in Traditional Inns/Ryokan in the summer.
A fully formal outfit consists of an underrobe, the men kimono (usually black) with mon (family crests) on it, hakama (like a kilt, but longer) and a haori (waist length overcoat)zori and socks. There’s also a keko obi (a narrow obi). Theres also some ties, underthings and other accessories (like a small formal folding fan) involved, too. A full men kimono outfit can (and does) cost a couple to several thousand dollars! A lot of Japanese people rent formal clothing because of the cost involved with purchasing them, but even renting them is expensive.
The Haori (羽織) is a traditional Japanese hip- or thigh-length jacket. It is worn open or kept closed by a string that connects the lapels.
Hakama (袴) are a type of traditional Japanese clothing. Trousers were used by the Chinese imperial court in the Sui and Tang dynasties, and this style was adopted by the Japanese in the form of hakama beginning in the sixth century. Hakama are tied at the waist and fall approximately to the ankles. They are worn over a kimono.