If you are riding in the heat - I'd recommend a good pair of loose-fit bike jeans (with full kevlar lining and pockets in the hip for protection to slide in) Knee armour - I'd recommend the 'knee-stocking' type, which won't displace if you end up in the dirt.
For jacket - a decent air-jacket in textile with armour in elbows, shoulder and back. Dainese, Alpinestars, Rukka etc. On cool mornings - simply wear the lining or a light fleece under.
The latest textiles with Cordura and Armacor are possibly better in a tumble than leather, too.
Leather is all fine and dandy - but not if it cooks you.
Gloves too - a pair of midlength gloves with vent-holes.
And on the XR - remove the handguards. That helps a lot.