It's just too time consuming, let alone £££ consuming.
All the styles and fashions are constantly changing, I haven't got the time nor inclination to trawl through the stuff to find something that I actually like AND is comfortable AND suits my (peared) body shape each season....this is not helped by my fluctuating weight/size. As soon as I find something I like and make it a staple, I cannot find it again in the same shop the following season.
It is so much simpler for mean - find a shirt/tee/polo shirt/tie in a brand you like, buy it in all 5 colours and repeat next time you need new clothes. Simples.