Blazer - arguing with the dictionary

I hesitate to argue with the good old Oxford Dictionary, or with any other online dictionary, but I'm going to argue - just this once.

The article/review setting me off on this tack is titled Pattern Recognition....The swoosh, the golden arches, the chevron, and a million other logos your hindbrain can recognize before you do.....by Seth Stevenson, published at Slate this weekend. Mr Stevenson refers to a book: In Marks of Excellence: The History and Taxonomy of Trademarks by Per Mollerup who surmises that the first trademarks “probably marked ownership - a simple sign to show that a weapon belonged to a particular man.”

Per Mollerup, in his book further says :

Today’s logos find their forebears in coats of arms and royal monograms. Marks of Excellence wonderfully contextualizes these building blocks of graphic identity. You’ll learn the rules of heraldry, and will soon be sorting invected lines of partition from embattled or dovetailed ones. You’ll spot the difference between chevrons, gyrons, inescutcheons, and double quatrefoils.

It's an interesting study: logos, trademarks, their derivation, history and use. From that article I re-visited an old post of my own from 2009:
Astrology and Heraldry

I casually searched the word heraldry and the term blazon. Also here.

Getting there......

No huge leap from blazon to blazer is there?

What is a blazer? It's a jacket which, in its original form, carried some kind of badge denoting membership of a club, group, military regiment, school etc. Sometimes - often - the badge was in heraldic form, sometimes shield-like in shape it carried more of a logo. Our school badge was an example, and was carried in miniature on all pieces of our dark green uniform, but in larger format on our green/white/black striped blazers (see right).

Over the decades the term blazer has been hijacked by the fashion industry and has come to describe a particular type of formal jacket, for males or females, nowadays no badge is needed for a jacket to be described as a blazer.

I propose that the term blazer was a derivation of the term "blazon".

However, dictionaries tell us:

Origin of blazer:

Late 19th century: from blaze + -er. The original general sense was 'a thing that blazes or shines' (mid 17th century), giving rise to the term for a brightly coloured sporting jacket.
Oxford Dictionaries.com

or

Blazer (n.) "bright-colored jacket," 1880, British university slang, from blaze (n.), in reference to the red flannel jackets worn by the Lady Margaret, St. John College, Cambridge, boating club. Earlier it had been used in American English in the sense "something which attracts attention" (1845).
Etymonline.com

I beg, humbly (or not) to differ.