1. RIDDHIMA'S blouse was the one she wore in the hypothermia episode (sid rid bed scene) to alter it the designer has just stitched a plane cloth in front
2. ANJALI'S lehanga was the one which ridz wore during salaam Namaste song sequence
3. SUVARNA'S dupatta was the one which ridz wore during shubhanker kirti's wedding , her dress was almost the same but to alter it the lehanga had embroidery
Don't know about the boys kahi unke kapdhe bhi to churaye hue nahi the