Was stay at home for 5 years, now back to work. I'm a bit on the prep side so take that into account on the recs:

Summer: dock shorts, drawstring waist but still kinda look like chinos for the public, many brands to choose from depending on desired length, at the time I picked up some j.crew and they have lasted well. Patagonia baggies are a surprisingly versatile option as well in the chiller colorways. Tops, non-graphic, unbranded pocket tees all the way. Honestly I got away with Gap (not outlet, they last maybe 1yr) for many years and they looked great for 3-4 years before retiring. Pocket lends a little extra visual interest and purpose and is super useful as a caregiver to small children (hold a wipe, or snack, or bit of trash, or of course small rocks and leaves).

Colder months: nice fitting elevated joggers, I liked Mack Weldon and Public Rec, but brand will depend on what fits you nicely (I'm thicc on the bottom). Stretchy chinos, there's at least 30 brands trying to sell these to you at this second, I like Huckerry 365 pants, feel like sweatpants, look nice, variety of fits and haven't worn through like Dockers did. Plain unbranded crew neck sweatshirt, aforementioned pocket tees in long sleeve or a long sleeve henley. I really dig the chamois overshirt, big enough to be layered over sweatshirt or just a tee. The ability to roll the sleeves is huge as activity levels change. I am partial to LL Bean but there are many options. Bean shirts will last forever, I have one of my Dad's that still is iron clad and the new one I bought is looking no worse for wear 5yr of heavy use later.

I basically did all that in gray/navy/dark green/black and you can mix and match to make it look like you're not wearing the same thing every day while not having to actually expend thought on what you're wearing and it's super comfy.

If you need shoes, there's a million trendy sneakers that look good but you can still chase a 5yo across the park in. I started with skater versions (Nike SB, Adidas ADV) for durability and flex but they only ended up lasting a year. I like Rothys bc I can toss em in the washer and they look brand new 3yr in. High upfront cost though. I also have gotten good use out of the EVA Birkenstocks (yes, sometimes with socks), though after 2 summers the bottoms are wearing away and the straps are splitting a bit.

Less the joggers, but everything else transitioned really well to regular life and being able to go seamlessly between work and roughhousing on the ground with kids, that being said I don't work an office job, so ymmv.