Take a five-gallon bucket and pour in one gallon water.
Now get borax, which should be no more than nine ounces and add it to the water.
After that add boric acid in this water, which should be about four ounces in quantity.
Then, grab the paint stir stick for stirring this mixture and mix it until all the items get mixed well.
Now take the clothes you want to make fire resistant and soak them in this water or mixture. Or use a spray gun to squirt this mixture onto the clothing or objects, which cannot be submerged.
After soaking or spraying the clothes let them dry in the usual way, without any further treatment. When the clothes get dry they will be safe and ready to wear.