“特大号”的英语可以翻译为：outsize，XL ...

只有少数几个商店备有特大号服装出售.Only a few stores carry portlies.这件衣服是特大号的.This coat is a super size.我想要一份特大号甜甜圈和冰茶.I need a jumbo sized donut and an iced tea....