The Ajour stitch is a kind of stitch used in embroidery mainly to finish a hem.

It’s a crossed stitch that unifies two ends of the fabric making a decorative design.
In the video below we are able to see what is an ajour stitch and how it can be made:
Check out:
The Post’s Pinterest Board: https://br.pinterest.com/fashionsummedup/a/ajour-stitch/
The Post’s Brazilian Portuguese version: https://amodaresumida.com/bainha-aberta/
Bibliography: Callan, Georgina O’Hara; Enciclopédia da moda de 1840 à década de 90 / Georgina O’Hara Callan ; verbetes brasileiros Cynthia Garcia : tradução Glória Maria de Mello Carvalho, Maria Ignez França – São Paulo : Companhia das Letras, 2007.