As the Western Canadian Simms rep I have reached out to SS about his matter.
But to touch on a couple things posted here.
It's fine to wash Garments yes. But a couple key details. Goretex is essentially pores, and those pores clog with dirt, oil, other contamients. The process to clean it is simple enough, but you absolutely have to follow directions as SS did, and use performance fabric wash to first clean the textile, NOT a regular detergent, as it leaves residue in the pores, then a second process, either washed in or sprayed on, to replace the DWR water repellancy of the fabric. The final step involves heat to allow the DWR chemical to bond to the fabric and create the barrier. A hair dryer works best, but I've also let the garment hang for awhile first then used a low heat dryer cycle.
If your jacket is 'wetting out', meaning the fabric looks wet and is holding water, it's time to invest a few bucks in it to perform best.
Washing your waders is different, but also a good idea depending on use.
High performance textiles eventually require maintenance. Doesnt matter if you drive a Yugo or a Austin Martin, both need an oil change sooner or later, depending on use.
Your gear isn't any different.
I'd also advocate to buy gear based on usage...guide waders are called Guide because they are designed around guide type use...so if you fish a ton, don't expect guide type durability out of price point waders built for the weekend angler who only gets out here and there. You will be disappointed.
Talk to your store guy about your usage, then make a buy based on the that. Warranty isn't a guarantee that's automatic, it's case specific. We want to connect anglers to their best days on the water.
Regards,
Sbm