Speaking of Cloaks, why did the Defiant have a Romulan cloaking device, rather than Klingon?
The Treaty of Algeron, which established among other things the reinforcement and redefinition of the Romulan Neutral Zone, also had provisions that prevented the Federation from pursuing cloaking technology themselves.
If Starfleet now wanted to use a cloak, they'd have to consult and deal with the Romulans, even if they wanted to use someone else's cloaking device, so it's probably just easier to use a Romulan one since conditions would obviously be applied either way.
This and the fact that if the Defiant used a Klingon Cloak, the Romulans would surely demand to be there to observe its use. Given that the Romulans and Klingons were enemies by that point, and the fact that Klingon cloaking technology may have diverged since the Klingons and Romulans became enemies, maybe the Klingons refused to allow a Klingon cloak to be observed by a Romulan for security reasons.