Semi stitched means that the dress would come stitched with the seam left open so that you can customize according to your body language. In case of Salwar Kameez, the Kameez(Top) would come in a semi stitched form and the Salwar(Bottom) would be unstitched. The sleeves would also be pre-constructed. The back design and depth and the neck design and depth would also be pre-constructed. In case of Lehenga Choli, Lehenga(Skirt) would come in a semi stitched form and Choli(Blouse) would be unstitched.
In this case the outfit would be stitched according to the standard size chart.
In this case the outfit would be custom stitched according to the measurement provided by you.