No serious club messes with the basic design of its kit. You'll never see Liverpool, Man Utd, Man City, Everton, Spurs or Chelsea experiment with stripes, similarly Newcastle, Southampton, West Brom, Sunderland etc always stick with variations of vertical stripes in the same way Celtic and QPR have hoops. It's an important part of establishing the club's identity. Fannying around every other year just reeks of a small-time mentality and an insecurity about what the club stands for. The fact that we're The Tigers makes it even more ridiculous to even contemplate plain shirts.
Sunderland once messed around with the shirt with a candy stripe design in the early 1980s. I remember the uproar from their fans, Their fans, who take these things seriously, simply didn’t buy it and they reverted to their traditional stripes. They had a couple of seasons in the 1950s with plain shirts. Southampton have altered their kits on a number of occasions. Don’t know how their fans took to them.
Completely agree we should have stripes. That is why we have our nickname. A number of teams have played in plain amber shirts but none of them were nicknamed The Tigers and we wouldn’t have been if we had started out with plain shirts.