covered part of her otherwise naked breasts

[Maybo]

To my left, on the track, stood Red Molly in a short leather skirt like a kilt. Her thighs were muscular and enormous. Her long knife hung in a scabbard on her right hip. Her orange hair stood up in short spikes, a kind of punk-rock do. Wide suspenders held up her skirt and covered part of her otherwise naked breasts. She saw me looking at her and puckered her lips in a kiss.

Source: Fairy tale by Stephen King

What’s the difference between “covered part of her otherwise naked breasts” and “covered part of her naked breasts”?

 

[Rover_KE]

Wide suspenders (BrE braces) covered parts of her breasts so they were not completely naked.



Like those only wider and she wore nothing underneath.

 

[Maybo]

Does “otherwise” emphasise that except for the covered part, other part of her breast is naked?

 

[Rover_KE]

Does “otherwise” emphasise that except for the covered parts, the other parts of her breasts are naked?

Yes.