The more Original â„¢ version of the easter witch in sweden was youths dressing up as witches and doing some sheningans during easter
(original here as "the earliest recordings of the costume" )
(in the 21th century the people dressing up as witches are often toddler to circa 12 years old. So teenagers/early twenties being the people dressing up as witches for easter a bit different from how it is done today)
These youth witches dressed up in a more masquarede fashion than is done today. Therefore many of them hid their faces with odd looking masks. Wearing a mask also has the benefit of hiding which exact youth Did The Sheningans!
This older way of dressing up, using masks, can be observed here, in the 1930s, were some youths (early twenties/late teens is my guess) are wearing easter witch masks that are
https://digitaltmuseum.se/021016595463/paskkarringar-vid-stora-torget-i-karlstad-1936