The extra attributes gained from apparel are only active in games that are classed as practice mode, like mobile head-to-head games. If you look at the listings for club tournaments, or WGT tournaments, on your mobile device you'll notice an icon bottom right that shows a shirt with a cross through it. This indicates apparel attributes are not in play. That's why you see different results in club tournaments.
About your questions:
1. Most likely yes, because It's a brand new "feature".
2. No, same for every mobile player messing with apparel.
3. On your mobile device, go to your profile (tap top right), tap the apparel tab, tap edit apparel, and when you go to equip something it tells you the bonus attributes.
I hope that helps. Good luck mate, happy golfing.
Mick