Mat files were created in D/S4.0 .dsf files for the SummerDress by Ravenhair.
Should work in D/S4.5
However everybody can make their own mat files for any clothing item as the textures are full square images; blue dots and red dots.
The images are “public domain” [yes I made them]
To make dots turn into stripes, “0” one of the tiling options.
Dots ‘n Stripes - full square dot texture image plus some mat files