ETYMOLOGY
from fashion (n.) + -al
EXAMPLE
“… I ought you a letter in verse before by mine owne promise, & now that you thinke you have hedged in that debt by a greater by your letter in verse I thinke it now most seasonable and fashionall for mee to break. At least, to write presently were to accuse my selfe of not having read yours so often as such a letter deserves from you to mee. …”
From: Poems
By John Donne, 1633
‘Letters‘, a1607
Lexicophilia 