BLACKPINK‘s Jennie has flaunted the “exposed underwear” trend in recent photos. BLACKPINK’s Jennie | @jennierubyjane/Instagram In recent years, Jennie has worn more sexy and outgoing looks to when she first debuted, and netizens have seen her wardrobe mature as she gets older. | @jennierubyjane/Instagram | Calvin Klein On September 27, Jennie teased her upcoming project.…