Lay the lace over your shirt and press them both down flat. Iron it or pin it if you want. Then spray the bleach over it lightly, but enough to cover everything. Let it dry for a while. The longer you leave the bleach on, the lighter the bleached parts will get. You can take the lace off while it’s drying so you can see how light the shirt is getting. Once it’s as light as you want it, rinse it out and you’re done.