Adam Clarke on Genesis 38:25

The signet - חתמת chothemeth, properly a seal, or instrument with which impressions were made to ascertain property, etc. These exist in all countries.

Bracelets - פתילים pethilim, from פתל pathal, to twist, wreathe, twine, may signify a girdle or a collar by which precedency, etc., might be indicated; not the muslin, silk, or linen wreath of his turban, as Mr. Harmer has conjectured.

Staff - מטה matteh, either what we would call a common walking stick, or the staff which was the ensign of his tribe.