For shirts I’ve usually gone with Adidas or Nike, but this year I took a flyer and ordered some Puma shirts on sale and have been really happy with them.
For shorts I’ve been going with Gap/Old Navy for years because they sell shorts in different inseam lengths. As a guy with short legs, that’s a must for me as most standard length shorts will be right at or even slightly below my knee.
For shoes, I was a Truelinkswear fanatic for years, but I had some quality and fit issues with the True Originals, so I turned to Ecco and was shocked to find them even more comfortable than Trues. The Biom hybrid 3 is the best golf shoe I’ve ever owned. If I could afford to, I’d buy 10 pairs to keep in storage so I can wear them for years.