A fashion chameleon! On Wednesday, December 6, Gwen Stefani took to Instagram to show off her funky outfit, which had some fans reminiscing on her No Doubt days. The star, 54, donned a black bedazzled tank top and bright red high-waisted satin pants on top of fishnet stockings. She completed the look with a matching red coat, nameplate necklaces and chunky black boots. The mom-of-three’s platinum blonde locks were slicked back into a high ponytail, while she rocked full lashes and a swipe of her signature red lipstick on her face. “Forever the most beautiful!” one fan commented on her Instagra…