Why? You think people make it their business to memories symbols of all the countries in the world? Would you have any clue what the flag of Tunisia was if someone posted a picture here?
First of all Russia=/=USSR
And not you people trying to make it look like it has any real intention behind it. I'm sure she knows what the USSR is and what communism is etc. but she definitely isn't aligning herself with the ideas, it's just a really nice outfit by Vetements that I'd also buy no matter how much I disagree and dislike Communism.