The best thing here is to apply a leather balsam to the leather with a dry cloth to restore your jacket’s shine, however if you don't have one at hand then an alcohol free skin cream is also a viable alternative.

Avoid leathers contact with oil or alcohol based substances. Cosmetics, perfumes, hand sanitizers, and disinfectants all can damage the quality of your jackets outer, along with the colouring.

- Also, don't let water sit on your leathers for too long, and ensure that you wipe with a soft, dry cloth to avoid saturation

Leather accentuates your physique with time, so if it's a bit tight then you can consider sticking to that very piece for a more snug fit however if it's a bit too tight then best get an exchange for a bigger size.

Yes but not for very long periods of time (good if you're travelling but not good for an entire season). Also when you have to do the same, then try to do so with the minimum number of folds and where possible, make the line of the fold follow a stitching seam.

No, ironing your jacket can likely ruin the leather, the best practice to remove any wrinkles from the jacket is to:
1. Wear it for some time & the leather will with time accentuate your physique.
2. Keep your leather on an appropriate clothes hanger when you’re not wearing it, don't keep it folded like a t-shirt.

This will make your jacket shrink & also dry it out of it's natural oils, so no.
And a big NO for the washing machine.

Leather stored in damp or humid conditions may develop mold or mildew. Mold appears green or black and slimy, while mildew is white, grey, or yellow, with a fluffy, powdery texture. To tackle these issues, wear a face mask and gloves for protection & clean the leather with a damp cloth soaked in a vinegar solution to remove mold, allowing it to air dry. Prevent mold by storing your jacket in dry conditions with proper air circulation—avoid plastic wrapping.

Frequent wear enhances jacket suppleness, but if natural leather oils dry out, elasticity is lost. To prevent this, apply leather conditioner annually, or more often for jackets exposed to sun and rain.

As a natural, porous material, leather absorbs odors, especially when exposed to a bonfire. To prevent lingering smells, mix equal parts water and vinegar, apply with a damp sponge to remove smoke odor from your leather jacket. Afterwards, remember to condition the leather with leather balsam on a dry cloth or an alcohol free skin conditioner.