I've been sea fishing from the shore for over half a century so here's what I've learnt about clothing.
It's many years since I wore a waxed jacket on the beach but as far as I can recall I found that well waxed jackets are slightly sticky and end up with sand stuck to them particularly in the creases. This combined with movement is not desirable as it will lead to excessive wear. Regarding the zips I think mine were brass which is more resistant to corrosion but will deteriorate. Being splashed with salt water will leave a salt deposit when it dries out. This should be washed off as salt is hygroscopic and attracts moisture so probably not desirable in a wax jacket. If you ever get saltwater into your wellingtons or waders always wash out with warm water to remove the salt otherwise they will will remain damp for evermore also if they are cotton lined the lining will eventually rot.
I've discussed wet weather gear for use in sea fishing on a couple of websites and have been critical of Gortex which is easily damaged and requires regular maintenance. The breathability of Gortex and it's advantage are greatly exaggerated.
https://andrewskurka.com/why-im-hard-on ... f-hype-tm/
Both waxed jackets and Gortex type clothing will be fine for the odd trip to the beach but for long term use the best clothing is that preferred by commercial fishermen made of PVC/cotton as produced by the "Guy Cotton" company, there are others. They are 100% waterproof, tough, easily repairable and need no maintenance. As far as condensation and breathability is concerned just buy a size that gives a loose fit and allows air to circulate which provides a better solution than any breathable material.
I normally wear a long jacket/wader combination which is less prone to over-heating than a one piece suit or jacket and trousers when walking any distance. When stood in the surf I use a chestwader/short jacket combination. I also have a bib and brace option which is particularly useful when boat fishing and also a warm option in winter when fairly static. Front opening jackets are the best option for maintaining temperature when fishing on the move. Open them up when on the move and close them up as you cool off.
![Image](https://i.imgur.com/XHFDYrC.jpeg)