Gird thyself; the custom being to wear long garments, they were not so fit to go about any business until they had girt their garments to them; hence Jeremiah is commanded to get a girdle about him, Jeremiah 13:1, when he was to be sent on God's errand. The sandals were little other than sole leathers, bound or fastened with thongs. Thy garment; the uppermost vest, answerable to a cloak amongst us. God furnishes his people thus with necessaries, and he will have them use them, so far as they are able to serve them, even then when he is working of miracles for their deliverances.
Related Commentaries of Acts 12:8
Acts 12:8
8 And the angel said unto him, Gird thyself, and bind on thy sandals. And so he did. And he saith unto him, Cast thy garment about thee, and follow me.