Q. Is it correct to use commas before and after “myself,” “himself,” “herself,” “itself,” etc. in cases like “I, myself, wouldn’t wear that dress”?

A. Normally such commas would be unnecessary. When it repeats the subject, a word like “myself” is called an intensifier—it adds emphasis. Commas would draw even more attention to the subject, but unless you want readers to pause over that intensifier, leave them out.