Today I had a really great success story with a woman who needed almost an impossible jacket with longer arms, and a very lean body. 

She also had broader shoulders too which made it even more difficult. Another hurdle was the fact that she was rather tall and long waisted (~5'8") with a very lean build; probably a US 0-2 in the body but US 4-6 for shoulders and sleeve/torso length.

So what to do? After trying on many options, she left happily with the above Dainese Air Frame Women's Jacket, perfect for summer riding weather.  Dainese is a fairly slim brand, but not slim enough when you have to size up 2 times to fit your sleeves and shoulders.

What you don't see in the photo are also 2 key button adjustments; one at the bicep and one at the forearm to taper the sleeves even more. The last piece was adding a heavier back protector to take up quite a bit of volume in the body of the jacket.  I chose the Dainese Manis G1 Back Protector. The result was a better fitting jacket and a perfect sleeve length! This means that she can pretty much go with any Dainese ladies jacket in the same size and have a fairly good result with fitment.

Dainese tends to run narrow and long in the sleeves, but when you're caught outside of even this fitment, sometimes a little creativity needs to be employed for an ideal outcome.