Damn it would be vfery hard to find clothes if you are 300 lbs in decent shape. Ronnie wore the ugliest clothes ever! maybe not because hw wanted to but that is all he could find that fit. Jay cuttler is a good dresser but he also has to get most everything custom made. My cycle this year has really shot me uo in the 215-225lb range somewhat lean maybe 10-12% BF and I had to buy all new clothes not because my waist grew because my quads and inner thighs are WAY bigger!
I used to wear a large size t shirt and now my arms can't fit into a large same with my back and chest it's just too much! I am only 5 ft 6IN so being 215-225 range somewhat lean is pretty impressive to most people.
I had not run any gear for a few years and now that I started using again and using way more properly and with better understanding of everything(Drug wise and nutrition wise) the gains are crazy! My arms are only 17IN somewhat ripped and cold but that is still pretty big to average people. they might get to 17.5 with a pump. My arms a weaker part but they are coming up nicely with new training methods. the rest of me is growing like a weed and lean tissue. I'm big into low doses of Test,alot of winstrol,Primo,NPP, mainly all very lean mass building compounds or just hardening agents.
just with my somewhat enhanced physique I have problems wearing old clothes. PJ Brauns new line prime nutrition and blackstone labs have VERY good quality clothing. Best quality I have gotten from a supplemnt company. A X-large is a very well fitting X-large and they are very comfortable. I really like the prime nutrition T-shirts they fit very well. Kind of stretchy very soft cotten.