The good ol' half-up top knot works just as well for a formal affair as it does a day at the beach, but if your hair is on the thinner side, it can easily look limp and fall flat. Enter, you guessed it, hair extensions. Take a section of hair stretching from ear to ear; this will be the 'half-up' part. Add several clip-ins to this piece, attaching them at the crown, for extra thickness and volume, says Rubell. Using a fine-toothed comb, backcomb the pieces of natural hair in between the extensions to blend everything together, then twist into a loose knot and secure with bobby pins. Pro tip: Use pins that are the same color as your hair so that they're not noticeable.
