You’d think that by taking away her clothes you could make her feel naked. You’d be wrong. Add the collar, the ankle and wrist cuffs, lock a chain as a leash to her neck and then make her kneel in the outside at night, so the cold air caresses all of her. Then she will feel naked.
But you can do that even simpler. Just look into her eyes, no matter where or when, deeply. All the way down to that wonderful submissive slavegirl inside her. Study her, appraise her, run your gaze all over her. She will feel a thousand times more naked than the girl kneeling in the grass.