Okay - I've gone a little nuts researching nursing pads. LOL!
Check out
www.luxebabydiapers.com. I have her hemp, wool and silk nursing pads. The silk ones are my absolute favorite. Now, they are round circles, and when I got them I thought they would be way too small but they actually are not, and they fit nicely so not noticeable through my shirt.
My mom made me some knock-off Fuzzibunz nursing pads -
www.fuzzibunz.com and they are like 6 inches around and more bulky, but still surprisingly you can't see them through a shirt. They are fleece topped and very nice and soft.
I have some hemp nursing pads that are more like 5 inches around and these are very bulky. I wear these last.
I just bought the lilypadz and have not decided how I like them. Its weird to me to have that plastic-y stuff on my breast. But they will be great if I ever want to wear a really tight shirt, or plan on an evening out without baby. You can also wear these at night and go braless.
Good luck!