Long Hair Styles

Long, flowing hair is a great match for strapless formal dresses because it brings so much attention to the face and upper body.
Long hair also adds a youthful twist to formal wear (unlike a stiff updo) so it's a great way to look updated and modern.

Here's how to wear long hair with a formal dress:
Keep the volume under control with products designed to add texture and shine: structured curls (the kind you get with old-fashioned hot rollers) are out. Instead, opt for long loose waves or silky, stick-straight hair.
Long, sexy hair becomes the accessory, so go easy on other jewelry around the face. Earrings -- which need to be oversized diamond studs or chandelier earrings to be seen with long hair -- are all you need. Skip the necklace.
Take daytime hair into the night with a beautiful hair ornament or a look that is partially pulled up or back away from the face.

Hair lengths
Short:
Bald, hair that is completely shaved down to the scalp
Buzz, hair that is extremely short and hardly there
Cropped, hair that is a little longer than a buzz
Boy's cut, hair that is longer than a crop, but not yet hits the ears
Ear length, hair that is at the same level as one's ears

Long:
Chin level, hair that comes to the chin
Flip level, hair that comes to the neck or shoulder area.
Bra/midback level, hair that's at about the same point as the widest part of one's ribcage and chest area

Waist length, hair that falls at the smallest part of one's waist, a little bit above the hip bones

Tailbone length, hair that is at about the area of one's tailbone
Classic length, hair that reaches where one's legs meet his or her buttocks
Thigh length, hair that is at the mid-thigh
Knee-length, hair that is at the knee
Calf length, hair that is at the calf
Floor length, hair that reaches the floor