batfan08
Super Freak
In my mind, all DC properties and continuities have always existed together in different realities, and in the comics Convergence made that official a while ago, so it's really nothing new for me, it also expands on the idea that the TV universe is just another Universe and can coexist with the movies, which is perfect.
I doubt 90's Flash makes it into the show though, plus the costume must be rotten by now.
So? Make a new one. Just because the show took place twenty years ago, that doesn't mean his Barry couldn't have seen some upgrades, as well. Just so long as it retains the spirit of that original suit, I'm cool with a new one. As far as your other point goes, I thought it'd be awesome if they made every film universe part of an overarching multiverse, so, Batman '66 is happening at the same time the Nolan films are, or 89, or the 78 Superman movies, and so on, and so forth.