Check for you perfect fit in the size chart below(in inches):

Person's Chest  |      Size |   Ready Garment Measurement (in inches)                |
(in inches)          |                    |       Chest               |    Sleeve Length|    Coat Length   |  Neck    |Shoulder|
======================================================================================
  35-36 |  36(Extra Small)|  40"(36+4 Loosing)  |25| 29    |  15.5   |18|
  37-38      |  38(Small)        |  42"(38+4 Loosing)  |25.5|    29.5           |   16       |18.5|
  39-40        |  40(Medium)    |  44"(40+4 Loosing)  |26|    30            |   16.5    |19|
  41-42       |  42(Large)        |  46"(42+4 Loosing)  |26.5|    30.5            |   17       |19.5|
  43-44       |  44(Extra L)     |  49"(44+5 Loosing)  |27|      31              |   17.5    |20|