Only a suggestion but maybe need to consider that the t shirts are made from a better quality wicking type material instead of pure cotton which tends to lose its colour/shape quickly. Cost more initially but better value for money long term and a bit better for wearing under leathers on the bike. Lots of companies use this material now so shouldn't be difficult to source. Just an idea:yo:
In a previous life, I was in the dry cleaning business. You'd be surprised how you can abuse silk. LOL.