Charm school instructors […] can do something even for the plainest of plain Janes.
Source: wiktionary
Plain jane
Synonyms for "plain jane" (3 found)
Ranked by relevance and common usage.
Sample sentences
2 total sentences available.
Many of the early models had both a "plain Jane" model with open sights and a Deluxe (DL) version that had an aperture rear sight and a hooded target-type front sight-and, in some cases, sling swivels.
Source: wiktionary