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"However, the Pastor should have offered to buy him a suit".

Maybe you are unfamiliar with rural churches in the south in the 50s. The underpaid preacher was probably doing well to buy his own suit and likely didn't see a need for my father-in-law to wear a suit.
My point was that it shouldn't have mattered to ANYONE what the man wore as long as it was clean and not indecent.
The ignorant but hurtful remarks of one person in the church left an indelible impression on the lives of three people which has lasted for nearly a half century.

Is there for honest Poverty
That hings his head, an' a' that;
The coward slave-we pass him by,
We dare be poor for a' that!
For a' that, an' a' that.
Our toils obscure an' a' that,
The rank is but the guinea's stamp,
The Man's the gowd for a' that.

What though on hamely fare we dine,
Wear hoddin grey, an' a that;
Gie fools their silks, and knaves their wine;
A Man's a Man for a' that:
For a' that, and a' that,
Their tinsel show, an' a' that;
The honest man, tho' e'er sae poor,
Is king o' men for a' that.

Ye see yon birkie, ca'd a lord,
Wha struts, an' stares, an' a' that;
Tho' hundreds worship at his word,
He's but a coof for a' that:
For a' that, an' a' that,
His ribband, star, an' a' that:
The man o' independent mind
He looks an' laughs at a' that.

A prince can mak a belted knight,
A marquis, duke, an' a' that;
But an honest man's abon his might,
Gude faith, he maunna fa' that!
For a' that, an' a' that,
Their dignities an' a' that;
The pith o' sense, an' pride o' worth,
Are higher rank than a' that.

Then let us pray that come it may,
(As come it will for a' that,)
That Sense and Worth, o'er a' the earth,
Shall bear the gree, an' a' that.
For a' that, an' a' that,
It's coming yet for a' that,
That Man to Man, the world o'er,
Shall brothers be for a' that.

Robert Burns