Sewing kits were discontinued on 16 March 2018 (V1.18) after a revamp of the game's economic model. Existing ones were not removed from the game, and would later be sellable to an npc for reputation. There was a bug for a few days after sewing kits were discontinued were upgrade kits still gave sewing kits when salvaged; this has since been fixed.
The main way to earn sewing kits was by salvaging Sewing equipment, which could only be obtained through leveling up. They could also be obtained through making via the Research workshop and from salvaging upgrade kits.
|2 + 1 (50%)||Sewing equipment|
|1||Any upgrade kit|