Beginning with Secret Defenders #15, the mysterious Shadowoman became a core member of the team. This led to a recurring question on the series letters page, as reader after reader asked why Shadowoman appeared in the same red costume previously worn by Spider-Woman (specifically Jessica Drew).
The web-gliders on the sides of Spider-Woman's uniform were the key distinctions between the two characters.
The costume confusion ended with Secret Defenders #22 as Shadowoman not only adopted a new black uniform but also changed her codename. The character now called herself Sepulcre, a variant spelling of the word sepulchre, which hinted at the cryptic nature of her powers.
The cover of #22 showed the character's figuratively transform from her original Shadowoman costume into Sepulcre.