long, loose stitches that are used to hold two pieces of cloth together temporarily before they are sewn together in a neater and permanent way

Remove the tacking. 把松散的长针脚拆掉。

Suits are typically sold with tacking stitches holding the vent at the back of the jacket in place. 西服出售的时候，通常会用松散的长针脚把外套背后的开衩缝起来。