If you want analog, I would have actually suggested your Sinn for a suit (or first the equivalent Citizen Duratect titanium PMD56, which is a lot lighter), so I'm probably not much use to you.
If it was up to me though, the best watch for a suit is the Casio GW-5000 or GW-S5600 if titanium is preferred (I get nickel allergy from many stainless watches when it's warm and will never again under-estimate the comfort of light weight - at 47g, the GW-S is extremely comfortable!).
Digital, slim, goldilocks sized, easily legible, 24hr time, world time (two time zones at once ie GMT, which I really like when travelling), timer, stopwatch, alarms, solar, auto backlight etc etc, It's cheap as chips (relatively) and probably the most robust watch that money can buy. Looks great too, IMHO. I used to spend more on watches but can't justify it now - those more expensive versions have literally no benefits to me over one of these...