That's because you haven't clarified what the "time-frame was that someone in Hollywood declared Fanny Packs to be out of style right when tight jeans came into

That's because you haven't clarified what the "time-frame was that someone in Hollywood declared Fanny Packs to be out of style right when tight jeans came into being". https://archive.org/details/clarion_yb_1945/page/n27/mode/2up?q=%22tight+jeans%22 https://archive.org/details/clarion_yb_1945/page/n27/mode/2u... shows that "tight jeans" were a thing in the 1940s (that links to a 1945 yearbook entry listing a pet peeve of "girls who wear tight jeans and sweaters"). I assume the "someone in Hollywood" refers to Yankovic's 2006 song "White & Nerdy", which characterizes the fanny pack as part "white and nerdy" fashion, indicating how it was no longer part of pop culture fashion by then. He lives in Hollywood Hills, I believe. That was 18 years ago. It's amazing that Yankovic has that much influence on modern clothing styles.