Why do Balenciaga short sleeves have trapezoidal marks?

All the short sleeves of Balenciaga are the letters of their brand, and sometimes there is a letter mode below. The borders of these two look like a trapezoid.

19 19, Cristóbal Balenciaga founded the clothing brand Balenciaga. This clothing brand, which was born in Spain and developed in France, has been famous for its fashionable and elegant tailoring for nearly a hundred years. At that time, Balenciaga almost became the royal clothing brand of the European royal family. Nowadays, it is the favorite brand of major stars.