la solapa - lapel; flap of a book or envelopeSpanish example: La chaqueta tiene un acabado de lujo con refuerzos en la solapa.
English example: The jacket has a deluxe finish with reinforcements in the lapel.
Source: la solapa - lapel; flap of a book or envelope (https://www.123teachme.com/spanish_feeds/word_of_the_day/2022/11/22)