Disney by Sephora Who's-It is a neutral-toned, light white with a frost finish. It is a limited edition eyeshadow.
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Who's-It is described as a "glittering white." It's a semi-sheer, shimmery white with neutral-to-warm undertones. I wouldn't describe it as glittery; perhaps sparkly but the shimmer seems finer than sparkle. I didn't have any issues with fall out from this shade. There's no shortage of shimmery white eyeshadows on the market, but a few of the closer dupes I found were: Disney Ball Gown, which was a touch cooler; MAC How to Marry, which is slightly more pigmented; and NARS Flowers 1 #1, which is cooler-toned. See comparison swatches (there are also several more similar shades that I pulled out).
Looking for something similar or to see what you have in your stash? Here are some of the top dupes for this product!