Yeah, its not overly made clear in the rules/srd, which says:
PREREQUISITES
Some feats have prerequisites. Your character must have the indicated ability score, class feature, feat, skill, base attack bonus, or other quality designated in order to select or use that feat. A character can gain a feat at the same level at which he or she gains the prerequisite.
A character can’t use a feat if he or she has lost a prerequisite.
For me and my table I would have to say that Pre-reqs should be met without aid, say from the aforementioned gloves, if only from the fact that its almost always a action on the GMs part to have a PC lose an item or device and if that's all that's keeping that PC from keeping that ability/feat too...well, that's just "extra painful" for a player/player character.
Some may say that that's tough luck and the player would be dumb for taking a feat he could lose/waste "so easily", but I guess its just me. Better to make pre-req's a little tougher to make the game more fun in the long run.
Along the same lines, if a wizard PC has a head band of intellect on
all the time does he get the bonus spells, ability to cast higher level spells too?
EDIT:
Just thought of something else. When you wear an item that boosts an Ability. It doesn't change your Ability, it merely gives you a Temproary Ability Score (its why its on every 3.0/3.5 PC Sheet made, practically). Thus the SRD's definition of
"Your character must have the indicated ability score" is not "technically" being met, as the gloves would give you a Temporary DEX of 18, not a Dex of 18.
It might be nit-picky, but it is a viable answer, I think.
...well...its a
thought at least...
