seamfree
/ˈsiːmfriː/adjective
1- (of tights or stockings) having no seams up the backs of the legs（紧身衣, 长袜）腿后无缝的。
1.1
- (of underclothing, especially a bra) having no obvious seams so as to provide a smooth contour under close-fitting clothing（内衣, 尤指乳罩）无突出缝合线的。