http://www.tlcdirect.org/default.aspx This is a non-profit shop from
The American Cancer Society/BC area. It sells wigs, scarves, mastectomy bras and camisoles.
I bought a camisole from them. It was not cheap, but it had three advantages:
1) it opens down the front with velcro, easy to use with one arm
2) it has two pockets and two breast forms (I will only need one; the other slides out of its hidden pocket easily)
3) it has two inner side pockets for drainage bulbs, necessary for a period of time after a mastectomy. They are removable when no longer needed.
This is the only place on-line I found this camisole.