can someone please tell me what kind of pattern form this trouser have?
It is a para commando trouser, I think it is English...
Those are Belgian flecktarn trousers. The pattern is very similar to German flecktarn, but the blobs are slightly larger.
More info HERE
but aren't they English? I thought sow with the arrow on the label...
They are Belgian, just as Camo_Fiend said, similar to German flecktarn but with bigger dots.
Just because there is an arrow does not mean that they are British, the Brits actually use a specific arrow shape, called a "Broad Arrow". It looks like this
Also, Seyntex does not make any British kit to my knowledge. However, they DO make Dutch kit in DPM (That some brits sometimes get away with using on FTX's
) as well as different items many other European Nations (ie: Denmark, Norway, Germany, etc...) use.
Hope I was able to explain it well enough!