For a Drop Veil:
To determine the total length for your drop veil - select a spot on your head where you believe you'll place the comb or pin the veil in. Make sure to allow a few extra inches in the front or back if you plan to place the pin/comb over or under a high updo. Place a string or ribbon at this spot on your head, and let the string fall over the front of your face. Do not pull it taught. Measure this length out on a ruler - this is your Front Blusher Length. Then take a string from the same spot on your head and let it fall down to where you'd like the veil to end in the back. This works best to actually wear your gown while you measure. Measure this length out on a ruler as well - without pulling it taught. This length will be the back length for your drop veil. Next, add the front blusher length and the back length together to get the Total length for your Drop Veil.
For example, if you measure from a spot on your head and the front blusher length is 30", and the back length is 42" - you would add these together for a total length of 72" for your drop veil.
For any other veils:
You will measure the same way as for the Drop Veil, except you will not need to add the numbers together.
Find a place on your head where you'll be placing the comb. Try to measure with a similiar hairstyle as wearing your hair up or down can affect the length of the veil.
Place the string or ribbon on your head (where you think you'll be placing the comb) and then let it fall naturally in the back to the length you'd like. It is best to do this while wearing your wedding gown, especially for longer veils. If your gown has a full skirt it may measure out differently then if your gown is very slim and form fitting.
Take the string and without pulling it taught - measure out on a ruler.
For a blusher - do the same thing - just let the string fall in front of your face instead of the back.