I have an idea I can try. I'd better do a little experiment with old clothes that I don't wear at home first. See the effect, and then use the same method to make this signature suit. This is similar to the principle of batik, which attaches candle wax oil to every signature on clothes. This matter should be handled with care. Anything that you don't want to wash off should be dripped with wax evenly, and both sides of the clothes should be soaked evenly. In a few days, just do the laundry according to the normal laundry procedure. Water can't penetrate into the place covered by wax, so those signatures are preserved. As for those who drip wax, you can put the clothes flat on the table with the oily side up, then put one or two pieces of paper on it and iron them repeatedly with an iron to remove the wax oil from the clothes. Cover the toilet paper on the candle oil stain of clothes and iron it with a low-temperature iron. The oil stain will be absorbed by the toilet paper. Adverse effects: After carefully completing the two steps, there may be traces of wax dripping on the clothes. As for whether the trace is obvious or not, it depends on your handling method. Good luck.