underlap

[uhn-der-lap]

verb (used with object), un·der·lapped, un·der·lap·ping.

Origin of underlap

First recorded in 1865–70; under- + lap²

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

In many cases, it is advisable to have an underlap of the material.
Textiles and Clothing
Kate Heintz Watson
The placket of a skirt should have an underlap extending well below the opening.
Textiles and Clothing
Kate Heintz Watson
On the left side of the skirt sew an underlap of sufficient length to extend well below the end of the opening.
Textiles and Clothing
Kate Heintz Watson
This is the type most likely either to overlap or underlap, depending upon the prison rgime and the after-parole circumstance.
Criminal Types
V. M. Masten