The problem is theory and reality. 17th frimaire AN XI an order came from Paris that the band musicians had to wear the same dress the drummers / hornists wore.
April 1807, August 1810, Sept. 1811. There are enough orders and material lists about reduction of the expensive add ons to fill a book. The colonels did not care and so the tête de colonne looked mostly like a circus band. Worse, any new colonel normally changed it. So any source we have is just for that unit AND date.
The battalion musicians mostly wore normal soldier dress with added wings.
Some elite companies used the bearskin, some not.
Some of the sappers wore another fantasy variation, others wore the band dress and ordinary soldier blue was most common. (15th LI sapper in 1809 red jacket with blue vest and collar, grey trousers with thick red stripe. Black bearskin with red feather and bag. Strange)
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