Klingons have always had cloaks. Now. 
I'm going with it. Why not? We didn't even see a D7 until the third season, so whatever.
TOS had to introduce everything. So you had to have someone wondering "What's that?", so they can explain it to the audience. Otherwise, they wouldn't have. No need to do that here.

I'm going with it. Why not? We didn't even see a D7 until the third season, so whatever.
TOS had to introduce everything. So you had to have someone wondering "What's that?", so they can explain it to the audience. Otherwise, they wouldn't have. No need to do that here.