Fix The Posture, Not The Reminder
The standard advice is to fight your posture all day. Set reminders. Do the stretches. Strap into a brace and grit through it. It works for as long as you are actively thinking about it, which is never long, and it costs you energy every waking hour.
A structured support layer inverts that. One garment does the holding, so your back is supported whether you are thinking about it or not. You stop managing your posture and just have better posture. At your desk. In photos. Walking into a room.
You already know how you want to carry yourself. Let the layer do the work.