I have a brat and the servo wires are jest sticking out everywhere, how do you get the wires to look a little cleaner. 
You can organize the wires by using braided sleeving like this:
http://images2.cableorganizer.com/expendable-sleeving/pet-black-s.jpg
1/4" for single wires or larger ones if you want to group them together.
Do you think the 3/8" size would fit three or more servo wires?
Search the forum for “braided”. There have been a few threads discussing this product and a lot of information is already documented.
An example is lynxmotion.net/viewtopic.php?f=8&t=5668&p=57217&hilit=braided#p57217
3/8" and 1/2" is too rigid. I’ve got some here and it’s not good for bots. I found the 6mm (1/4") is suitable for up to 4 servo wires. I bought from two places. The pricing was about the same.
Hobby King - hobbyking.com
]3mm <- too small/:m]
]6mm <- works the best/:m]
]8mm <- is ok/:m]
]10mm <- too rigid/:m]
TechFlex - techflex.com
]1/8" <- too small/:m]
]1/4" <- works the best/:m]
]3/8" <- too rigid/:m]
]1/2" <- way too rigid/:m]
Looks great!
Kurt
Do the servo connectors fit threw the 1/4 sleeving?
Yes… You see the stuff expands like a snake swallowing a mouse. 
http://images2.cableorganizer.com/expendable-sleeving/pet-black-s.jpg
Jim,
Can the material be cut along it’s length, so that wires may enter/exit at intermediate points, without damaging it’s structural integrity?
dj
What size would you recommend to fit six servo wires?
Don’t think so… It would look and work better to nest the stuff using heat shrink at points where wire needs to exit the sleeving.
Dunno, I’ve never tried it. 
BRAT’s only got 3 servos per side. It should not need all the servo wires to be bundled into one single harness.
For flexability, using two sleeves with three wires might be better than six wires in a single sleeve.