Hi Rajesh,  if you have a cured laminated made from your material then cut the laminate and polish the edge of the sample. now if you observe through a microscope at 25X or better 100X then you will be able to see the fiber planes.  but you have to be careful as to your woven ply as it will  show two different orientations ( dependent on how you have chosen to cut the laminate.

If on the other hand you  just have a woven jute fabric then just use two 25 mm dia plates of known thickness and then place the fabric between the plates and use a vernier caliper to  derive the thickness.

hope this helps

Standard work practice is to make laminate using your material  and interesting method  of fabrication (wet lay-up  ,infusion  etc) using approx  number  of layers eg.  If you have to make 8milimeter thic you should use 10 layers and to measer after curing