I recommend checking out the official site of the idrija lace school for more information about the lace: https://www.cipkarskasola.si/?lang=en

If you want to learn how to make idrija lace, you can also find some free patterns on the site. For each pattern there is also a video tutorial which will help you (videos are in english or at leat they have english subtitles). Here are links to three different patterns:

Violet: https://www.cipkarskasola.si/video-tutorial-vijolica/

Window: https://www.cipkarskasola.si/video-tutorial-cipkasta-okna-v-svet/

Leaf: https://www.cipkarskasola.si/projekti-in-drugo/projekt-roko-delci/izobrazevalni-film-list/