How do lounge pants differ from other pants?

Lounge pants are meant to facilitate impeccable comfort without giving ‘out of bed’ pyjama kind of vibes. Lounge pants are comfortable casual wear which is a bit more casual than jeans.

Is it okay to wear loungewear in public?

You can wear loungewear in public as long as you are not attending an event or a meeting. Loungewear, when styled properly can be worn out while chilling with friends too.