Global Mens Underwear Market Size, Share Demand Report By Product Type (Briefs, Boxers, Boxer Briefs, Trunks, Long/Thermal Underwear), By Material (Cotton, Modal, Microfiber/Polyester Blends, Lycra/Spandex Blends, Bamboo), By Distribution Channel (Online Retail, Offline Retail, Brand-Owned Outlets, Third-Party Retailers), By Age Group (18–25 Years, 26–35 Years, 36–50 Years, 50+ Years), By End-Use (Casual/Everyday, Athletic/Performance, Formal/Professional, Thermal/Seasonal), By Region & Segment Forecasts, 2025–2030