When I was younger, I was quite adamantly opposed to tucking anything in. As I've grown older though, I've come to understand how much it can clean up an outfit, and create a waist where there wasn't one before. Raiding my mom's belt collection may have helped to spur this change in thought as well. It was so much more convenient than actually shopping for belts!
Ray-Ban aviators, J. Crew silk cami, Rich & Skinny jeans (similar), vintage belt (c/o my mom), Steven by Steve Madden shoes (similar).