No sleeves no problem, and they are called the summer suits
or more aptly sleeveless suits. It is more suitable for the hot and humid climate and makes the wearer feel more comfortable in the attire.
The sleeveless suits stitched without sleeves or the sleeves cut and removed and it shall be something to look similar like a tank suit. Sleeveless suits can be both formal and informal. Wear it in the office or at a casual get together, and the choice is entirely yours. The best thing about these suits is the wide options available in both the men and the women section.