For me, none of the special nursing things were worth it.
Shirts were proportioned all wrong.
And don't even get me started on the bras. Especially in conjunction with a nursing shirt.
Normal bra + normal shirt = put hand under shirt super-quick, pull cup down, pull shirt up just enough, totally covered, private, nothing but side flab showing. When done, pull shirt down and a hefty yank on the bra strap could pull cup up, at least enough to put baby upright on shoulder on that side and fiddle with it later when it would just look like a normal woman fiddling with shirt/bra. Go on with day.
Nursing bra + nursing shirt = put hand under shirt, first through neckhole to unclasp thing, then under shirt to pull down cup flap, pull shirt slits open, stick NIPPLE through shirt (augh), totally exposed all around aerola as baby does various things to try to not get shirt into mouth. When baby is done, NIPPLE sticking out of shirt slit, close shirt slit (which has gotten stretched out of shape with baby's touching of it, might be slobbery). Stick hand *all the way down front of shirt* to grab cup flap, pull up, clasp with *one hand* while holding either sleeping or very happy milky awake baby, sweat buckets, face red from exertion, want to toss bra in garbage.
Gimme a soft cup bra and a regular t'shirt *any* day.
And DS is 4, my breasts are nowhere near as large as they were in the heyday of nursing, but I'm still a 36 F, and I was a nice little 36 C when I first got pregnant. So it's not that I had small breasts while nursing, oh dearie me no.