I know that if I get up in the morning and go in and sit and sew. By the afternoon, my neck is bothering me. For awhile, it didn't hit me what might be causing the discomfort. I have a great chair to sit in and it helps with posture. AFter about 3 days, I got dressed and I noticed how my neck and shoulders didn't bother me. So I always make sure I at least have my bra on. Personal experience. I would never presume to know how well endowed anyone is. It isn't the size that counts, it is what we do with it.