oneofbilllions

[carmine apex]

Please be patient

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[valid quiver]

Mocassin = loafer
Chausson = slipper

[formal horizon]

In terms of English:
Mocassins are of native american origin, usually more rounded and with a more "traditional" styling, often both shoes will have the same shape and be interchangeable. Often meant to withstand quite a bit of weather while still being comfortable
Loafers are more work casual, shiny black outer leather is common
There can be a bit of overlap, especially with big companies picking whatever term they like better for marketing since language is at least a bit fluid, but I don't think I'd understand if someone referred to most loafers as a "mocassin"

Chaussons are slippers, which are usually just casual wear and not business casual or for much outdoor wear, though some are made to look more stylized or be more ambiguous

In terms of french usage of mocassin/loafer (in France, since I can't imagine them being used much differently than English in Canada) it seems like they're used more interchangeably? Presumably due to less contact with English + native people?