An idiom meaning flawless and natural beauty with no trace of artifice; perfectly seamless or immaculate.
彼女の演技は天衣無縫で、多くの賞賛を集めた。
Her performance was flawless and natural, earning much praise.
この小説は表現が天衣無縫で、読みやすい。
This novel's expressions are so seamless that it's easy to read.
天衣無縫の仕上がりを目指して、作者は何度も推敲した。
Aiming for a flawless finish, the author revised it many times.