Definition of open-breasted in English:
open-breasted
adjective ˌəʊp(ə)nˈbrɛstɪd
1Not concealing thoughts or feelings, frank. Now rare.
2Having the breast exposed. Of a garment: not covering, or only partly covering, the breast.
Origin
Late 16th century. From open + breasted.
Definition of open-breasted in US English:
open-breasted
adjectiveˌəʊp(ə)nˈbrɛstɪd
1Not concealing thoughts or feelings, frank. Now rare.
2Having the breast exposed. Of a garment: not covering, or only partly covering, the breast.
Origin
Late 16th century. From open + breasted.