Polyester clothes (and synthetic fabrics in general) cause allergic reactions in a lot more cases than natural fabrics, including in me. Personally, I avoid wearing anything that has more than 10% poly composition, to avoid skin rashes.
Not to mention everything made of a synthetic fabric is awful to the touch to further reinforce how it's not something suitable for humans. Not to mention washing them results in microplastics polluting water for absolutely no reason, which then affects sea life and similar life forms living in any body of water.
For those worried about sportswear, there are sewing techniques that can make cotton and other natural fabrics just as efficient as poly-shit, and more efficient in some cases. Some less popular brands use these techniques.
However, don't expect it from the likes of Nike, Adidas, Puma and other big names. Not happening unless they're fully cornered. They get worse in quality every season, and their design follow suit for the most part.
My birth country's Army has some properly-woven cotton clothes that are resistant to many things. For example, water doesn't get through, while they are still very breathable. Emphasis on "some".
If you buy bottled water, it would be best to switch to buying a water filter (even better with ioniser). This is because plastic bottles are often exposed to thermal stress (i.e. very high and very low temperatures) that weaken the structure, making microplastics contaminate your drinking water (or milk/juice/whatever is in those bottle).
I have a water filter at home and prefer using glass containers, as metal usually gives it a bad taste.
With drinks, it's also best to avoid cold drinks as they disrupt your stomach environment. Your stomach needs high heat to operate. Inserting cold drinks will lower the temperature resulting in incomplete digestion, much like Western toilets result in incomplete elimination.