First, splay the suit out on a flat surface.
If the razor becomes filled with pills, take them out carefully before proceeding.
The second option involves using a Velcro strip from a bag, shoe, or hair rollers.

The sharp strands should latch onto the pills and remove them with ease.
For this method, you simply cut the pilling out at its base.
For that reason, the smaller the scissors, the better the results.

Obviously, the easiest thing to do is to prevent pilling in the first place.