I use Charlie’s soap and don’t have any problems with static electricity on clothing.  Here’s a few other ways to avoid static electricity.

Add moisture to the air: Use a humidifier or boil water or a simmering potpourri on the stove. Houseplants help, too. Lightly spray your carpet with a 4-to-1 mixture of water and fabric softener.

Metal: Try vinegar as your fabric softener and a ball of foil or a few safety pins attached to a sock or washcloth in your dryer. Avoid mixing synthetic garments with natural fabrics in the dryer, too. Run a wire hanger or dryer sheet over the garments when wearing them.