"6. An expert or enthusiast of any kind. One might be an astronomy hacker, for example."
http://catb.org/jargon/html/H/hacker.html
And the result of this hacker matches the second canonical definition of "hack":
"2. n. An incredibly good, and perhaps very time-consuming, piece of work that produces exactly what is needed."
http://catb.org/jargon/html/H/hack.html
The production of this dress was an appropriate application of ingenuity that resulted in a carefully crafted work of art, which is literally hacking:
"Hacking might be characterized as ‘an appropriate application of ingenuity’. Whether the result is a quick-and-dirty patchwork job or a carefully crafted work of art, you have to admire the cleverness that went into it."
http://catb.org/jargon/html/meaning-of-hack.html
It is interesting (to me at least) because it is something I have not seen before, done skillfully, and is not Yet Another Article About Rust or Containers (YAAARC).