The concept of covering the body and thus saving from the forces of nature started in the prehistoric time when people used to dwell in the jungles and forests and relied on the foods available in nature.
Then people used to wear the barks of trees. Later they started to use the skin of the animals they killed for flesh to eat. The skin was more durable than the barks of trees and people thought that they should develop some technique to make the products usable and durable.
Gradually they invented several tools which were later developed to complicated machines and the virtue of which people later landed himself to the present age of industrial automation implementing the new techniques. You can also buy sweatpants and heavyweight sweatshirt via https://www.inkdgeneration.com/Outerwear/
Clothing was the concept and later this clothing proved to be a vast area of research and development. People concentrated on the use of the clothes and thought how they could make the same more comfortable, fashionable and everlasting or rather durable from the earlier times.
The physical structure was the prime importance at the time of making the clothes and the activities of the people came to the lime light from the very beginning. They also thought of the games and other physical activities where people were involved in.
The custom sweat pant is a result of the fruitful thought of the clothes designers who invented the same so as to facilitate and help the active sports persons in their regular activities keeping in mind the activities involved the game and also the stress to be exerted on the clothes.
Custom sweatpants are loose enough which can be prepared to accomplish over other item of clothing like shorts. The layering contribute to the attractiveness of sweatpants among all the athletes, for the sweatpants can be used before or after and during games or competitions, where at any time the athlete is not running.
It still has the need to preserve loose muscles. But, as mentioned, Custom sweatpants have undergone a wide range of transformations and changes in the very recent years.