She looks like more of a magical girl in the outfit.

And now she has the same hair color as Cirno and Kogasa.

And Nazrin's outfit... at least that's what it resembles.

Her robe seems like those Buddhist's head monk, minus the talisman/necklace ribbon thingie.

Guys, seriously. You need to stop adding hopeless_masquerade tag to Ichirin images.

PrincessBlackRose said:
And now she has the same hair color as Cirno and Kogasa.

Here maybe, but in the game, I'd beg to differ. It's closer to Daiyousei's, if you want to compare it to someone.
And while we're at it, we could compare that gem on her chest to Okuu's third eye or Tony Stark's reactor.

S1eth said:
Guys, seriously. You need to stop adding hopeless_masquerade tag to Ichirin images.

Is there a justification for this? This is Ichirin in the outfit she has in Hopeless Masquerade, which has a precedent in that Remi's Curiosities of Lotus Asia outfit is tagged with the CoLA tag. This isn't the only example of an outfit being tagged with their source if it differs from a character's usual outfit. However, I will defer to Danbooru.

Yukari has a different costume and hairstyle in immaterial_and_missing_power than she had in perfect_cherry_blossom, yet we don't tag every image she appears in with the game tag.

The individual game tags are for images that reference/parody that specific game.

S1eth said:
[...]
The individual game tags are for images that reference/parody that specific game.

I think this image fulfills that criteria. Given that the influx of these images is tied to Ichirin making a comeback in the new game, and that this is her outfit from the Hopeless Masquerade and not Unidentified Fantastic Object (as she wears a much plainer blue-white habit there), I think differentiating between the two costume variants is fully justified.

Otherwise, I suggest tagging these with the alternate_costume tag (or is there a variant_costume?), if you'd point out that nothing in the image references the new game explicitly.