My standard recommendation is the Rios Mittenwald in whichever colour you prefer:
https://www.watchobsession.co.uk/collections/rios1931-watch-straps/products/rios1931-mittenwald-retro-organic-leather-watch-strap-in-black?variant=17112868094023
It's not the most formal strap (not sure how smart you want it to look), but it's nicely made and very soft and comfortable.
What's the buckle width on those, 16 or 18mm?
Buckle is definitely 16 on the 18mm and 19mm Mittenwald straps. I think also on the 20mm, I have a 20mm one as well, I'll check.
Edit: yep, also 16mm buckle on the 20mm.
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My standard recommendation is the Rios Mittenwald in whichever colour you prefer:
https://www.watchobsession.co.uk/collections/rios1931-watch-straps/products/rios1931-mittenwald-retro-organic-leather-watch-strap-in-black?variant=17112868094023
It's not the most formal strap (not sure how smart you want it to look), but it's nicely made and very soft and comfortable.