Those are definitely not vanilla boots. You must have installed a replacer at some point, that also added a female version of the boots to add the stockings.
Regardless, you should have nif files most probably in your data/meshes/armor/stormcloaks folder pertaining to female version of the boots. You can easily add the "wubba" to them.
Launch Outfit Studio
File > Load Reference -> CBBE 3BBB Body Amazing
File > Import from Nif -> meshes/armor/stormcloaks/(whatever the female boots are named.nif)
Select the female body, switch to Bones tab, multi-select the following bones;
NPC L Thigh
NPC L RearThigh
NPC L FrontThigh
NPC L Calf
NPC L RearCalf
NPC R Thigh
NPC R RearThigh
NPC R FrontThigh
NPC R Calf
NPC R RearCalf
Switch back to meshes tab, select the boots, right click > copy Selected weights (keep default options)
Select the body, right click > delete
File > Export to nif to same file location, same file name
Do the same for both the _0.nif and the _1.nif
If you don't see an immediate change in game, ditch the boots you're currently wearing and add yourself a new pair for it to take effect.