If the wearer is a spontaneous caster, once per day she may use a spell slot to cast a spell from a written source (such as a scroll or spellbook) as if she knew that spell. The spell must be on her spell list, the same spell level or lower than the expended spell slot, and the same type of spell (arcane or divine) as the spell slot expended. The caster must also understand the written source (such as using Spellcraft or read magic) and be carrying it. Activating the robe is not an action, but casting the spell otherwise works as normal, including casting time, providing components or foci, and so on. Using a mnemonic vestment’s properties does not consume the written source.
My question refers to the bolded text. Does "carrying" mean the user must be holding the scroll in hand, or can the scroll simply be in the user's pocket to count as being carried?
This is just from memory and I could be wrong. But I recall that you are considered to be carrying something so long as it's on your person and not contained in an extradimensional space.
"Carrying" refers to having stuff on your person. Example: "carrying capacity".