Technical explaination:

I created the electricity flow over the shirt using a vertex map with a timer loop. Then I mapped the matrix over the vertex map and used a Volume Builder and Mesher over the matrix.

The Volume Builder is invisible, and I only used the points from the volume mesh in a Tracer, which connects all the points with splines. This creates a sort of web of points connected by splines.

Then, the splines have an Electrify modifier, which makes the splines look like electricity.

I created another vertex map for the shirt. This vertex map detects the places where the splines intersect with the shirt, which creates those sort of touching electricity points.