A Pennsylvania court in Horton's Estate held that legacies are subject to garnishment by a creditor of the legatee while the property is in the hands of the deceased's executor. The case also intimated that had the testator so provided in his will this process would not lie and the creditor would have to stand by until possession of the property passed to the legatee. This last bit of dictum has since been established as the law of Pennsylvania by Holmesburg Building Association v. Badger.
Herbert R. Whiting,
WILLS - VALIDITY OF CLAUSE RESTRICTING ALIENATION OF A LEGACY DURING ADMINISTRATION,
Mich. L. Rev.
Available at: https://repository.law.umich.edu/mlr/vol40/iss1/8