I layer my tops! I have nursed two babies and I use Old Navy Tamis under most of my tshirts. Then I can pull up the tshirts while leaving the Tami down so I am covered and it is loose enough to pull down at the neck and unhook the nursing bra.
I plan on doing what I did with my daughter and wearing a nursing tank and at shirt over top. Or one of those scoop/loose neck style tops when it's nice (I don't know fashion names lol).
Nursing tanks or tshirts with bra and just pull up at home. Pretty easy and comfortable. I don't like how nursing camis are so tight though wish there were looser options which is why I just do a tee most times. If going out I have button up flannels and denim shirts too. Work when I go back will be interesting though If I have to pump during day.
Re: Nursing Clothes
http://natenkim.wordpress.com/
https://m.asos.com/us/search/nursing?q=nursing&pgeSize=50&SearchSuggestUsed=true
Also I have three words for you to help keep comfortable. Fleece. Lined. Leggings. So much better than going back to jeans right away.