Guys, let's settle down. Differences of opinions are natural but remember to keep it civil and respectful. @GreedyCat it's OK to disagree with someone but this should be an inviting place for people to share ideas. If you have something constructive to say, feel free. But please avoid being confrontational.
As for the original idea, I don't think it's so bad. I would have used it before prestiging to sell all my parts for gold to buy outfits, before I already bought all the outfits.
To build on the idea, it might be nice to be able to "favorite" some parts and group those together. Then the option to sell all non-favorited parts would be appealing.