1 INTRODUCTION

2 TARGETS AND OBSERVATIONS  
2.1 Target selection  
2.2 Observing strategy  

3 DATA REDUCTION AND METHODS  
3.1 Imaging polarimetry  
3.2 Interstellar polarization removal  
3.3 Normalised SN position  
3.4 Host-galaxy morphological classification  

4 RESULTS AND DISCUSSION  
4.1 SNe Ia in spiral vs. elliptical galaxies  
4.2 Explanation of the peculiar dust properties  
4.3 Polarization angle alignment with galactic features  
4.4 The cases of SN 2006X and SN 2014J  
4.5 SNe Ia in lenticular galaxies and morphologically unclassified galaxies  

5 SUMMARY AND CONCLUSIONS