When something arrives without warning, or surprises you. This expression is part of the phrases made Valencian and has many variations such as Nyas Cabàs, probably if you do not know it, this shirt will not grace you.
Women's clothing size
With your arms relaxed at your sides, measure around the fullest part of your chest.
Measure around the narrowest part of your natural waist, generally around the belly button. To ensure a comfortable fit, keep one finger between the measuring tape and your body.