[ leather trenchcoat can be crafted with the following recipes

Autolearned
Player Recipe
Primary skill used: tailor(6)
Required skills: N/A
Time to complete: 180 minutes
Tools required:
> 1 tool with sewing quality of 1
> 1 tool with cutting quality of 1
Components required:
> 22x leather patch OR 4x tanned hide
> 45x thread OR 45x sinew OR 45x plant fiber OR 45x yarn
Byproducts:
(none)
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This recipe can be found in the following books when tailor is at least the required level:
Sewing Techniques for Designers (level 4)
clothing designer's portfolio (level 4)