The phrase "as proper as" is correct and usable in written English.
It can be used to compare the appropriateness or correctness of something to a standard or another reference point.
Example: "He wants his presentation to be as proper as the ones given by the senior executives."
Alternatives: "as suitable as" or "as appropriate as".
To be liberal, if not leftist, is as proper as a quilted handbag.
In short, the British public proved they were not nearly as proper as the American artist had supposed.
He is able to assess a situation then impose himself upon it, pacing his innings accordingly, and the pleasure he takes in competing hard is as proper as it is infectious.
(The Dickinsons, Emily included, were never quite as proper as they seemed; beneath their clannish façade of stiff-necked gentility roiled a soap opera of mad scenes, quarrels, and illicit passions. All of them, Wineapple writes, "loved with greedy ardor").
Such provisions, as parts of inspection laws, are as proper as provisions for inspecting quality, and it cannot be said that the absence of the latter provisions, in respect to any particular class of tobacco, necessarily causes the laws containing the former provisions to cease to be inspection laws.
MY KINGDOM for a Martha Stewart shed, for a Smith & Hawken potting table, a cream-colored pegboard with the perfectly hung tools, an enameled and labeled can with fluffy potting soil and an alphabetized seed file -- how I long to be as proper as the gardeners in magazines and on TV programs.
He's very proper, as well as sweet and loving.
The new procedure is general, being applicable to both proper as well as non-proper systems, and is significantly more efficient than an exhaustive search based approach.
Seve's memory will be celebrated with the appearance of his youngest son in the tournament proper, as well as at Tuesday's special event.
The agency, which is run by his former aides, said such trips were proper, as long as the primary purpose was related to official state business.
The lands of Galicia and Volhynia were always ethnically and economically distinct from the Kievan region proper, as well as from more distant regions.
