I'm wearing a good bra, day and night and I haven't breastfed since February.
My advice may not be appropriate for you. That's ok. You are just fine how you are and I am the right kind of me.
Raynaud's can cause it, but so can trauma. I have had it during pregnancy and while BFing. Warmth is very important. I was always in pain if I got too cold while pg! And it may just be because I'm sipping Natural Calm as I type, but magnesium may help... Cal/Mag is okay, but mag is often more deficient and harder to replace. Natural Calm is a great type.
HeatherB ~ mama to 3 wonderful boys: 03/02; 09/04; 09/07 - and Eliana, 11/13/10!
Founder of Houston Birth Alternatives: Be Informed, Encouraged, Supported birth support group and aspiring midwife.
Raynaud's tends to affect extremities (hands/feet, and apparently nipples) in response to cold, but not necessarily cold of that area. Keeping warm in general helps. I've taken to wearing more layers on my torso than I might otherwise to prevent it when I'm exercising in colder weather. I had a football player (I'm an Athletic Trainer) who needed to wear a wool cap/neckwarmer whenever possible to keep his hands from losing circulation.
TMI solution...DH has been willing to "help" draw blood back into them. It's pretty instantly relieving.