Just a quick note.
Do not get too concerned if your bra outline, such as the straps, seem to show up as your look in the mirror. While I prefer to have it appear that I am wearing no bra, it is just fine for us MTF women for the bra to be noticeable under your clothing. You're not intending for it to be noticed, it just is at times, depending on what you are wearing. If it simply a faint outline, do not let that bother you much.
If it looks like you are being squeezed a lot, perhaps you need a bra fitting or a replacement bra. A camisole can hide some bra lines, as do some materials and layers, of course. But I have a T shirt bra that is not hidden by simply wearing a t shirt. Maybe I have not found the right T shirt bra yet!
As a woman, people know that you wear bras for support and the bra's slight visibility is not really an issue. Perhaps if you are NOT a MTF but simply like to wear bras maybe then it may be a concern to hide their presence.
To be open, and really I have not done this much at all, but every once in awhile I purposely want a strap to be seen for a bra or camisole, or the lace at the bottom of the camisole. But of course, never at work! Usually this is when I am with my sweetie and not in public. I am simply conservative in dress.
Chrissy