Were all Tirthankaras clothesless?
No. In Jain tradition, there is a sectarian difference:
- Digambar tradition teaches that Tirthankaras are clothesless after renunciation.
- Shwetambar tradition teaches that Tirthankaras do not remain clothesless; they are depicted in white garments.
So the answer is: not according to all Jain traditions. The belief differs between Digambar and Shwetambar Jainism.