Best way to attach a veil to a tiara?

Try small hairpins; they can be twisted and bent. Then you can remove the veil and have boththe tiara and veil for another occation.

Glue gun on the bottom or transparent nylon thread?

thanks i’ll try. Idk how good it’ll look though =\ haha

duct tape

On the picture description is states that it is plastic?
Can’t hot glue plastic without wrecking the tiara.
Why not just place the veil on the persons head, then place the tiara over top of this veil, that way the combs on this tiara will pierce the veil into place.

Monofilament fishing line. It’s flexible, nearly invisible. and you can take it off without harming the tiara.