I wouldn’t EDC the D4S, and it’s approaching maximum diameter for carrying inside a pocket, but still doable unless they’re ‘skinny jeans.’
I like to have clips on all my lights, even the larger ones. Not just for pocket carry, but also for staying in place inside a pack.
I even use clips on my medium and large-ish throwers. I sometimes clip them to the outside of a pocket while hiking, but I’m careful to keep track of them.
I actually just ordered a handful of different clips to experiment with on my Noctigon K1 and Acebeam E10.
I like the E10, and even convinced myself to try the green LED version after seeing it for only $40 on Amazon. The listing I ordered is back up to $50, but this one is still $40. The title is confusing but the specs list the ‘color’ as green.