A basic sewing kit. Required to craft and repair clothing.
In-game description

A tool that is required for repairing or improvising clothing.

A sewing kit cannot be repaired or harvested.

Fishing tackle can also be used to repair clothing with the same effectiveness, and it can be fairly easily made at a work bench later in the game.

Although the kit sometimes spawns in or near first aid cabinets, it is not used for first aid. The sewing kit is packaged as a product named Ace Mending Kit.

Tools
Cooking Can openerCooking potRecycled can
Fire Starting
Starter FirestrikerMagnifying lens
Accelerant AccelerantJerry canLantern fuel
Ice Fishing Fishing tackleHookLine
Hand Tools
Standard HacksawHatchetHeavy hammerHunting knifePrybar
Improvised Improvised hatchetImprovised knife
Hunting
Weapon Distress pistolHunting rifleRevolverSurvival bowStone
Ammunition Flare shellRevolver ammunitionRifle ammunitionSimple arrow
Lighting FlareFlashlightMarine flareStorm lanternTorch
Mending Quality toolsRifle cleaning kitSewing kitSimple toolsWhetstone
Sleep Bear skin bedrollBedroll
Story Jeremiah's knifeScrap metal shard
Other CharcoalMountaineering ropeSnareSpray Paint
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