(1) Hair may touch the collar, but will not fall below the collar's lower edge. Hair that would fall naturally below the collar's lower edge will be neatly and inconspicuously fastened or pinned. During physical training periods in which physical training clothing is worn, hair will be allowed to fall naturally, without being fastened or pinned. This does not apply when conducting physical training in the utility uniform.
(2) Hair will be styled so as not to interfere with the proper wear of the uniform headgear. All headgear will fit snugly and comfortably around the largest part of the head without distortion or excessive gaps. Hairstyles which do not allow the headgear to be worn in this manner are prohibited.
(3) Faddish and exaggerated styles to include shaved portions of the scalp other than the neckline, designs cut in the hair, unsecured ponytails and styles which are distinctly unbalanced or lopsided are prohibited. Multiple braiding is authorized. If hair extensions are used in the braiding of the hair, the extensions must have the same general appearance as the individual's natural hair. Braided hairstyles will be conservative, and conform to other guidelines listed herein.
(4) Barrettes, combs, rubber bands, etc. are authorized, if concealed by the hair. Inconspicuous hair pins and bobby pins, if required, are authorized. Hair nets will not be worn unless authorized for a specific type of duty. Wigs, if worn in uniform, must look natural and conform to the above regulations.
(5) Cosmetics, if worn, will be applied conservatively and will complement the individual's complexion tone. Exaggerated or faddish cosmetic styles are inappropriate with the uniform and will not be worn.
If worn, nail polish and non-eccentric lipstick will harmonize with the scarlet shade used in various service and dress uniform items (i.e. scarlet cord on green service cap, scarlet trim on blue dress uniform, and scarlet background on enlisted insignia of grade), in shades of red, and may be worn with the service, blue dress, blue-white dress and evening dress uniforms. Colored nail polish will not be worn with the utility uniform. Fingernails with multiple colors and decorative ornamentation are prohibited. Nail length will be no longer than 1/4 inch from the tip of the finger.
(MARADMIN 199/01)
(6) No female Marine will be required to remove leg hair except where considered unsightly and cannot be covered with appropriate hosiery as described in subparagraph 3027.5. (ALMAR 352/96)
http://www.marcorsyscom.usmc.mil/sit...MCUR/URCh1.htm