They're from a Mod, They're not Vanilla.
For Vanilla, there are "Lingerie Stockings" and "Paw Lingerie Stockings" that count as Sexy Clothing, or you can use anything that you make Jun wear and get a response from her saying something like "S-so... These are the sexy clothes..."
But if you would like the mod, you have to join our Discord Community Server, and you can download The Mod from there. There are Instructions and everything from Adding a Mod to Making your own Mod.
Here's a link to join our "Discord Community Server" (Hope the link does works.)
https://discord.com/invite/DNPZcSVK52?utm_source=mainmenu_mdrg_0.90.10&utm_mediu...
and Here are "Fishnet Stockings Mod"
https://discord.com/channels/813853552400138261/970335900779294780/1325143281348...
https://discord.com/channels/813853552400138261/929160364594188329/1031690361443...