胸围26,胸围26是多大

5,49,26*2,39.5,51.5,28*2,42,53,28*2,42.5,25.
5cm56cm袖长4.8cm66cm67.5cm69cm70.5cm1/2袖肥25cm26cm27.2c
怎么测量胸围?女生买内衣测量胸围的重要性!
  面料:棉   平量尺寸:背心:衣长:63cm 肩宽:26cm 胸围:40
下胸围29cm,衣长26cm(含肩带)