How to spell HATSTO correctly?

The misspelling "hatsto" can be corrected to "hats to", "hast to" or "has to". Depending on the intended meaning, one of these corrections may be appropriate. "Hats to" might refer to giving hats as gifts, while "hast to" is archaic and means "must" or "have to", and "has to" means "must" or "is required to".