I imagine the AV oversuit material would not enjoy the regular washing in a machine - certainly not at elevated temperatures. Polyurethanes are somewhat susceptible to breakdown by hydrolysis, I'd imagine the higher temperatures of a washing machine and movement would speed up de-lamination.
I've owned one Warmbac and two AV suits in 10 years or so of caving. Developed an intense dislike for the Warmbac as I basically couldn't move in it, I accounted for shrinkage but even then the fit was generally poor for me and the fabric incredibly stiff. I'd take the hit for digs with a short (!) commute, but generally think you're expending way too much energy moving in them.
The first time I put on an AV was a revelation, and have found mine to last reasonably well. My more recent one is 3 years old, starting to show significant wear but I find that acceptable with the amount of caving I do.
To those using Aquasure on their AV suits, I highly recommend switching to Sikaflex EBT+ (available e.g. from Screwfix). Picked up that tip on the forum a while ago, and it's hands down the best repair tactic I've ever come across. For spreading it on your suit I recommend diluting the silicone down with odourless paint thinner (I use hexanes, probably not available to most people) and painting areas of wear.* Regular white spirits work as well, but the silicone somewhat retains the smell and it's not pleasant, especially in smaller passages.
For those tempted to make a siliconised boiler suit, I should add the silicone is quite "sticky". Actually useful for keeping knee pads and similar in place, but not so good if you have a large siliconised area in contact with cave you're trying to move through.
*You do need to use a hydrocarbon/ aprotic solvent to dilute it down, liberal airing highly recommended. I'm tempted to see if IPA works but my guess is it won't.
