Chrissy Teigen's Boobs Have Good Days, And They Have Bad Days

Chrissy Teigen's knockers have a mind of their own when it comes to squeezing into jumpsuits ... according to their owner.

We got Chrissy and asked her about the extremely busty video she posted of herself trying -- unsuccessfully though very entertainingly -- to squeeze into a one-piece. In her defense, it looked really small and everything still fit ... but her rack.

Some would call this a good problem, but Chrissy gave us her take. On her ta-tas.

Enjoy!