Good cycling shorts offer hours of comfort during long bike rides. The correct fit of the cycling shorts is important to sit on your saddle without pain. The cycling shorts are made of elastic fabric that fits tightly around your body. The cycling shorts are a so-called cycling bib: cycling shorts with suspenders. These suspenders keep the pants in place while cycling. This way the chamois of the cycling shorts will not chafe.
The advice is to take your regular size.