الجواب حامدا و مصلیا
1. Wearing Cap or Turban is not particular for Namaz rather it is a part of the dress and was from a customary Sunnath of Rasoolullahi Sallallahu Alaihi wa Sallam. Therefore one should refrain from being a victim of unnecessary doubts and claiming it to be a practice of Jews.
2,3 Husband is not responsible for executing Zakath of wife even if the wife does not possess cash to execute Zakat for her jewellery. She may sell a portion of her jeweler or request her husband to pay it for her. Further, husband himself or upon request of his wife, if pays the Zakat for her jeweler he will get the reward of Sadaqa and will be entitled to the virtues mentioned in the question.