Bisou Bisou White Lace Cocktail Dress 4

Size 4, has some areas that have some yellowing (I tried to include this in photos as best I can), but would be perfect for a fancy night out, prom, a bachelorette or groom's/rehearsal dinner. The lace is in good shape, I don't see any big flaws in the pattern (no holes/tears) but I also have not gone over this with microscopic detail. The yellowing is mostly around the neckline, lining on the chest and armpit area. I haven't tried washing this out/stain treating this due to the nature of the delicate lace. From a smoke-free pet-friendly home.