The clothes are of course made by experienced people; There are many different manufacturers that make a variety of different garments. Depending on the material, the items are made in different ways, some are sewn by hand, some are machine sewn and some are made in a completely different way. You can get more details about clothing manufacturer via https://white2labelmanufacturing.com/.
Manufacturers label their own clothes to distinguish them from others, some are mass-produced and sold to the general public at low prices.
Other manufacturers are classified as designers – these companies do not produce their goods to the same extent and offer clothing for different types of markets. All of their products are uniquely designed according to the latest styles and fashions, they often cost more money, but it can be explained why.
Some designers make special cuts called "one-off", which are very unique garments that require a lot of work and care. As the name suggests, manufactured items are the only items ever made and as you'd expect, unique outfits can cost a lot of money.
Why not try searching the internet for clothing manufactures and see what you can find, there is a multitude of different companies all with their own style and garments.