In Jain tradition, temple dress is guided by maryada (temple discipline), vinay (reverence), and aucitya (appropriateness), not by “which body part is better or worse.” The aim is a uniform, modest, distraction‑free environment for darshan and sadhana.

Why shorts are usually not allowed while a dhoti may be:

• Coverage of the knees: Most derasar/mandir rules ask that legs be covered to at least below the knee. Shorts are often above the knee and seen as casual/leisure wear, so they don’t meet the modesty norm. A dhoti, when worn properly, covers to below the knee or the ankle.
• Tradition and intent: A simple dhoti is a traditional, plain garment associated with simplicity and restraint. The rule is about modest, simple attire—not about allowing the chest but banning legs.
• Sect and local maryada differ:

- In many Digambar temples, men offering puja may keep the torso bare with a lower garment that covers the knees; this reflects simplicity and long‑standing practice. - In many Shwetambar temples, men are encouraged to keep an upper cloth (uttariya/angavastra) as well. Women customarily keep shoulders and knees covered. Local trust rules apply.

Practical way to comply respectfully:

• Wear garments that cover knees and are plain, clean, and non‑transparent.
• Men: use a longer dhoti/pajama; carry an angavastra to cover the upper body when required.
• Women: saree or salwar/kurta with dupatta; keep shoulders and knees covered.
• Avoid leather items inside, flashy designs, or tight/short clothing.

These norms are set by each temple’s managing trust as part of religious discipline in a sacred space; they apply to everyone equally who enters that space.

For simple temple etiquette and dress guidance, see:

• Basics of visiting a Jain temple
• What to do in a derasar

If you follow the local maryada—cover the knees, keep clothing simple and clean, and use an upper cloth where asked—you’ll be within Jain Dharma’s intent of modesty and reverence.