"'her clothes are dumb,' is relevant?'"

Yes, it's relevant. Do some reading. Young females in our society are under constant attack - a double-barreled campaign that says 'You must be perfect!' at the same time it says 'You are of no importance!'

The narrator of the video is supposed to be an important, informed person, but since she's a youngish female, she's dressed like somebody about to go turn the compost.

The message to her is clear: 'You didn't think you MATTERED, did you? You don't think you deserve anything SPECIAL, do you?'

[Have you noticed the starlets and models who are showing expensive gowns while their hair looks like they just got out of bed? Same idea: SHE doesn't matter.]

Special doesn't have to be expensive. Flair, art, individuality, and flattering color can be accomplished without expense. They also convey that the wearer is an accomplished person who is worth our attention.