She is wearing a white nun's habit with a chest curtain.

Her lower body is a slit dress, stockings, and long white boots.

If you want to cover your chest, try changing your stockings to bodystockings.

Clothing

 (white nun:1.1),nun outfit,habit,veil,cross_necklace,dress,(white nun over semi-transparentlight black stocking:1.4),(white nun over see-through black stocking:1.4),(white nun over sheer black stocking:1.4),layered outfit,short sleeves,puffy sleeves,white dress,(side slit:1.2),nun dress,habit nun,religious habit,cross,cross necklace,necklace,backless outfit,(breast curtain:1.3),(white boots:1.2),(thigh boots:1.2),heel,thighhighs under boots,gloves,white gloves,elbow gloves,

If you change your "stockings" to "pantyhose", there's a good chance they'll cover your butt.

Chara

blonde hair,(tsurime:1.2),wavy hair,bangs,(ahoge:1.2),(very large breasts:1.2),voluptuous_body,tall female,sharp eyes,blue eyes,round pupils,proud expression,glamorous,confident smile,(mole on breast,mole on butt,:1.2),