Yup, Lizzy - still in original trio form - opened for Slade on a UK tour at their peak in 1973. With
Whiskey in the Jar having been a freak hit, Lizzy were now - to the chagrin of the band - perceived as a singles novelty act, good to be put on a tour with Slade (and Suzi Quatro!). It wasn't how they saw themselves, but Noddy's mirror top hat and its reflections left a lasting impression.
Lynott was always a keen watcher, taking it all in: After visiting a Wishbone Ash gig around that same time (more of a "serious" rock band than either Slade or Suzi, Argus had been voted album of the year by Brit music publications in 1972/73), he decided that twin harmony lead guitars were the way forward for Thin Lizzy too. It's a debt that
der Holländer still refuses to acknowledge to this day, ghastly person he is ...
But what about Dennis Dunaway's mirror applications to both his EB-3 and Jazz Bass which likely served the same purpose of reflecting light on stage, did those come before or after Noddy's hat?