*waves at Nattie from Sydney*
Nattie, I've been on low dose for about 2 years with no intention of transitioning. I'm sitting somewhere around AA to possibly A cup, but my rib cage is big enough that I can get away with it without binding. Careful selection of better quality T shirts/polos which are relaxed fit works fine. I do say that genetically, I'm from a family of washboards. If you start HRT, be deliberate about keeping doses low - you will get some feminisation regardless, but it may be slow enough that it's unoticable to everyone except yourself. Hopefully low doses will be enough to help you keep your sanity till you're ready for your next phase.
Other stuff I've gotten away with:
Most people won't pick up on electro/laser to the face. I tended to swell pretty badly so I tended to get massively long sessions on the afternoon before a long weekend (3 days recovery before going back to work yay!). If you're presenting male, people will just assume that you shave yourself very cleanly. It'll only crop up as an issue if you're on a road trip with the guys and you're the only one without stubble in the morning.

Body hair management is usually ok, most people don't peg on that either, same with eyebrows so long as you don't arch them too much.
Basically an andro presentation won't scream "I'm transitioning" so long as you present male with your body language/presentation - if you act in a masculine enough manner, they won't notice anything amiss.
I've got more detail about my experiences in my low dose thread which I updated a couple of weeks ago.