I am an Artíst, so I am qualified to say this.
The FASHUNS of the future will probably be minimalist with an understated colour palette. This will reflect the constantly increasing movement to digital devices for every aspect of daily life, making pockets, etc. less necessary. However, they will have a more defined cut/shape, unlike, for example, a standard cotton t-shirt. I predict puffy sleeves, understated bladed shoulders, and/or other such things. Female clothing will show less skin but will emphasize hips, bust, etc. instead of letting them speak for themselves as many styles do now. Male clothing will become more feminine as skinny pants and fitted shirts will stay. In addition, it will be socially acceptable for males to wear clothing with frills, lace, puffs, or such things.
However, coats with a large amount of buttons, straps, epaulets, etc. may stay.
Pic totally fucking related.