As the clothes appear worn by someone, it looks more realistic and appealing than a photo of clothing on a hanger. You'll need to re-shoot your garments for this, but you only need a few photos, and anyone who fits your garments can model them.

Generally speaking, though, invisible mannequin shots are planned, as they require shots both with a mannequin or person and without. Keep this in mind as you're shooting your apparel photos.