Edwardian lightweight shirt blouse jacket size 32 short

For sale here we have .... we have no idea to be honest. It came with a fencing jacket and some naval uniform from around 1910. It's a very lightweight jacket effectively with cuff buttons and breast pocket, but in the weight of a shirt. Size wise it's in line with the fencing jacket at 32/34 short so probably for a child . 

Measurements 

sleeve - 20

shoulder - 15

length - 23

Armpit to armpit  - 17

Fit - 32 short

Condition - Excellent, just a couple of light dirt marks that will wash out.