He has a cheveril conscience. One that will easily stretch like cheveril or kid leather.
“Oh, here's a wit of cheveril, that stretches from an inch narrow to an ell broad!” —Shakespeare: Romeo and Juliet, ii. 4.
Your soft cheveril conscience would receive. If you might please to stretch it.
Shakespeare: Henry VIII., ii. 3.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894