The funny part is that it really isn't. In this case it's actually worse.
From a quick google search (and her overall design) you can tell she's most likely based off a black widow spider. They're completely dark but have very bright red markings like on her headpiece. It's a clever way to show that influence as the headpiece can act like spider eyes. Bright, bold colors in nature tend to come off as "wrong" to humans because we've evolved to see these as potential threats. The appeal of the design is that she's dangerous, somewhat imhuman, and most of all something to be feared. Something looks off about her in her original design and it makes it somewhat compelling. One of the better ones I would say.
Now compare this to BABD's redesign. They couldn't even stick to the color scheme. Instead, they gave her this ugly camo green that completely clashes with her original aesthetic and makes her ENTIRE MOTIF POINTLESS. Now her red headpiece that was a nice incorporation of multiple glowing eyes staring at you in the dark to scare off opponents just looks like an eyesore.
Her original outfit isn't even that much to begin with. I agree with the notion she has that weird sleeve thing, but you could justify it for ammo. The baggy pants just make it harder for her to move in ironically as she now has to deal with it being caught on something. At least the original was a skintight suit.
Also, the comment, "Purple isn't a very spidery color". Has BABD seen nature? One quick google search will show plenty of spiders in all shapes, sizes and colors. Try going to the Caribbean and saying multi-colored insects don't exist. You'll get a lovely surprise.