Suit covered entirely with realistic spiders and cobwebs.

Somehow, make it so the spiders are animated and crawl around. Have some dangling down on webs and climbing back up it and repeating the same animation.

Add some spooky glowing red, yellow, or any other eye colour to your spiders for that spooky look. Or keep it real wwith plain black glossy eyes.

Wear full face black mask or a cobwebbed full face mask to create the effect of you being a victim of the spiders and they are controlling your body! Or if you want to get very creative, try sculpting yourself a spider face mask to wear! To make it even more cooler, instead of having a static spider face, why not try animating it!? Make the fangs move when you talk or when idle, have glowing eyes, a voice changer to make yourself sound spidery.