Trews or false

[Glen]

The trews that I have are made of a tartan fabric with the legs having only an inner seam. ...Perhaps my question is, what makes a true trews?

Not being an expert, but you probably have true trews.

Trews should be high enough to wear with a kilt jacket and not show waist band or shirt below the jacket, thus are high waisted. Trousers are usually lower in nature, needing a longer jacket. Both belted waists and fishtails can be found on high waisted trews, although fishtails are more common. Fishtails are also found on white tie trousers and mess uniform pants, thus increasing the confusion.

Most trews and tartan trousers have both an inner and outer seams. Some military trews are made with only a single inside seam, which without a picture of the tartan and trews, it is hard to say, but also some civilian trews are made with only the inside seam.