Destroying this particular book, even were it not for artistic purposes, is no great loss. That yellow tint around the edges of the pages is a very clear sign that the book was NOT printed on acid-free paper, and thus wasn't long for this world anyway (a couple decades, tops). It's definitely a standard sort of thesaurus, also, so it's by no means scarce, and the digital form is significantly more functional, unlike with novels where many people still prefer the physical ones.
Meanwhile, as a dress, it's pretty remarkable - the detailing on the cups and center front is far superior to almost anything you can find in the average department- or wedding/prom-dress store. And the usage of the page size and the yellowed edges is superb - it really uses the material to great advantage and makes it very clear that it was 'a book' and not just printed fabric or paper. Even better, in the close-ups, you can see that the front manages to place the keyword 'gird' right at the waist, and also includes such keywords as 'garish' and 'genius'. As if it wasn't enough on its own, the other pics show her wearing a 'Miss-Spelled' pageant sash and a hairband ornamented with more pages along with the dress (and glasses, too). Clearly a very well-thought-out piece of work, fantastic technical execution, and really - what would be better than a thesaurus for a dress which is simultaneously a book? It's rather fitting, pun totally intended.