extra extra extra small

From extra +‎ extra extra small.

extra extra extra small (countable and uncountable, plural extra extra extra smalls)

(especially with respect to clothing)

1. (uncountable) One of several sizes to which an item may be manufactured.

   Synonym: XXXS

2. (countable) An item labelled or denoted as being that size.
3. (countable) One who fits an item of that size.

extra extra extra small (not comparable)

1. (especially clothing) That is extra extra extra small (the manufactured size).
2. Used other than figuratively or idiomatically: see extra,‎ small.