Presumed,

Polo shirt tucked in or out?

If out, try clipping a decent folder to your waistband under your belt. The clip is nearly invisible even if tucked. I carried an Emerson Viper this way for nearly 12 years with almost no one seeing it.

Now that my low class status is fully entrenched, I can wear a big fat watch, and my Filson vest everyday and cover up all sorts of stuff. <img src="images/graemlins/grin.gif" alt="" />

Another place I have carried a folder is clipped to the neck line of my undershirt. Vee necks tees or scoop neck undershirts support something like a polymer framed Spyderco very well. I am sure a sleeveless undershirt will be hidden by a Polo....sort of weird but....

I have also worn a Belly Band holster (4"wide elastic band with a couple of pockets), under a normal dress shirt that easily concealed a large folder.

You are absolutely correct about the Suunto watches; they look huge but wear light. I am a chemist working in a casual business writing code, so everyone expects me to fit the eccentric geek mode....I do not disappoint.