Buying a Barbour Liddesdale Jacket: Size help needed

[Basileus]

Hi, I would like to buy a Barbour Liddesdale Jacket online (there are not resellers in my town) but I'm unsure about the size. In particular, I'm torn between XS and S.

Here are my measures:
- Chest: 37" / 92 cm
- Height: 5'9" / 174 cm
- Weight: 143 lbs / 65 kg

Here are Liddesdale measures in inches:
XS (Chest 21,50 - Shoulder 18,00 - Sleeve 24,50 - Length 30,50)
S (Chest 22,50 - Shoulder 18,50 - Sleeve 25,00 - Length 31,50)

Here are Liddesdale measures in cm:
XS (Chest 53,75 - Shoulder 45,00 - Sleeve 61,25 - Length 76,25)
S (Chest 56,25 - Shoulder 46,25 - Sleeve 62,50 - Length 78,75)


Please notice that I will generally wear Liddesdale jacket upon a medium weight wool/cashmere pullover.

In conclusion: XS or S?

Thanks in advance.
--Basileus

 

[Basileus]

Desired fitting should be as follow:

http://thesartorialist.blogspot.com/...at-london.html


In fact I'm tempted by XS size but I fear it could be a but too tight and short...