Cycling pants without a built-in chamois are designed to be worn over a separate padded liner short. This two-piece system is especially common in mountain biking, where riders prefer baggy outer shorts for coverage and style, with a snug padded liner underneath for saddle comfort. It's also typical for rain pants, thermal over-tights, and some commuting gear.
The big advantage is flexibility—you can mix and match liners and outer shorts based on ride conditions, and you can wash the liner more frequently without wearing out the outer pant. Just make sure you actually have a quality padded liner, or you'll be sitting on bare saddle with zero cushion.
If you're buying baggy cycling shorts or pants and they don't include a liner, you'll need to purchase one separately. Check the product description carefully—some come with a removable liner included, while others are shell-only.