Describe your cloak and dagger?

When I was in high school, my best friend always used to ask me what I imagined when I heard the phrase “cloak and dagger”. Oftentimes, I would imagine a cloak that was midnight blue and made of silk and very billow-y, while the dagger was something fairly simple-and sort of like a bowie knife.
So, what do you imagine your cloak and dagger looking like?
I ask this out of curiousity, since before this friend I’d never really pictured the phrase before and I wanted to know if other people had spent a lot of time thinking about this.