The phrase "illusion lace" refers to a type of lace fabric that creates the illusion of skin underneath. It is often used to create a sheer or see-through effect on clothing, giving the appearance of lace directly on the skin. Full definition
Chiffon A line wedding dress features exquisite illusion lace neckline. (weddingdresstrend.com)
«Ivana» sleeveless gold Chantlly lace dropped waist A-line wedding dress with illusion lace straps and tulle skirt, Kenneth Pool (brides.com)
Take a good look at this quarter sleeve illusion lace high low dress from Adrianna Papell and see if you would agree with me when I say, «You'll look totally stunning in this gown.» (creativefashionglee.com)