Keep in mind that conventional guidelines are becoming more constrictive as well, so this is not a surprising development.
Other abnormal responses Square wave response Seen in cardiac failure, constrictive pericarditis, cardiac tamponade and valvular heart disease.
The garment should fit well and allow freedom of motion without being constrictive.
Anything that is too snug, constrictive or otherwise ill-fitting will eventually make itself known in a very unpleasant way as the night wears on.
If it does, seek out a few different styles, including those with "floating" underwire bras, which move along with you and feel less constrictive than traditional underwires.