Misc advice on office pants

Work in a professional office setting, I was wearing wool slacks prior to covid, which required frequent dry cleaning. And many of which are probably close to retiring so rethinking wardrobe when offices reopen.

Anyone have advice on washable darker brown/khaki type pants that could be worn with plain white long sleeve button up and tie (doesn’t need to match a jacket/blazer).

For that matter if they come in slate, etc. as well, even better.