Hands in the diaper

So my almost 17 month old cannot wear any of her cute outfits (pants and shirts) because she has discovered that she can stick her hands in the back of her diaper AND that she can undue her diaper 🤦

She is literally wearing onesies and shorts and that's it.

When does this phase end? I cannot tell you how many times she has stuck her hand in her diaper only to have 💩 all over her fingers (this was before I decided to exclusively dress her in onesies).