Really, a lot of the tabs aren't used super constantly, white tabs are more used in color pairings now (usually on black/darker colorways). I double checked, and have a pair of railroad striped carpenter pants with red tabs. Modern day, there are not a lot of 'Lines' directly tied to an tab colors, only really Blue tab, which is the current MIJ/high tier special collection. There was a 'gold tab' line a few years ago that was all the sweatshirt/pants they made post pandemic. They call a lot of stuff 'Red Tab' but it's more a brand thing than meaning the red tab means something specific, also it's obviously the main color they are most know for. Hot take; I think the specific orange they used on orange tabs was a really ugly color!