Disguise Skill

General Skills Rules: Taking 10: If you are not threatened or distracted you can take 10 on a roll. Taking 20: when you have plenty of time, 2 minutes or more and faced with no threats or distractions, you can take 20. This does not count as a ‘natural 20’ and indicate automatic success. Generally this takes 20 times longer than normal. You can’t take 20 on any check that has consequences for failure. “1” Rolls: When you roll a natural 1 on a skill check, roll D20 again. SUBTRACT this number from your check. “20” Rolls: When you roll a natural 20 on a skill check, roll D20 again. Add this number plus the 20 to your check.
Disguise (CHA)
Requires: you are required to make a disguise check opposed by another’s spot check to determine how well you appear who you are trying to be. This may be as a result of a spell or a manufactured disguise, which takes 1d3x10 minutes of work.
Synergy: 5 or more ranks in bluff gives +2 in disguise.
Disguise DC modifiers include: 

• minor detail only +5, 
• different gender -2, 
• different race -2, 
• different age category -2.
If impersonating a particular person, the viewer’s familiarity modifies their spot check: 
• would recognize on sight +4, 
• friends or associates +6, 
• close friends +8, 
• intimately familiar +10.