The 50/50 shirts are great. I've got a stripe shirt that first turned me on to them and I went online and bought a bunch of blank ones in different colors. My current company found a similar shirt from bella+canvas that is also great. It and the stripe shirt are the only vendor shirts in my regular rotation.
What is very frustrating is I have 2XL shirts from 2007-2009 that fit better than a 4XL from 2022. I've tried to narrow it down to brands and blends and the 50/50 or tri-blend shirts have held their true sizes for longer but somewhere along the way every brand has seemed to have gotten smaller by full inches. In underarmor polos I now buy their tactical line to get the equivalent of their "loose" fit from yesteryear. It is so frustrating and sometimes a huge money waste buying shirts.
The longest lasting shirts in my closet are some Hurley and Billabong shirts from Hot Topic and similar from 2010 or earlier.
For any conference organizers or swag buyers reading this, please start offering up to 4XL in any cheap brand shirts, especially 100% cotton, even if it is preshrunk.