Hi Jay, so sorry to hear what you and your wife are going through.  When I had chemo I lost all my hair, which leaves the scalp feeling a bit sensitive, so I started using "CHILDS FARM SHAMPOO" which you can buy from Amazon.  It is a very mild and gentle shampoo and I found it ideal.  Also, Amazon do a really nice range of head scarves and hats, specifically designed for folks who have lost their hair to chemo.  I bought a wig, but I found it hot and itchy, and I stopped wearing it and stuck with the scarves and hats.  Good luck to both  you and your wife on this journey, I wish you all the best. 

My wife commemced chemotherapy in November. She was warned that her hair would fall out after the first session. That was true. She had her third session on Monday (three week intervals). She uses electric shears on her head for convenience. She has a couple of wigs but prefers a hat. She has now become extremely tired. She says her arms itch but doesn't use any special cosmetics.