His parents refuse to let him shorten his lower garments. Should he obey them?

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Check below answers in case you are looking for other related questions:
Her mother is in love with her husband’s brother and she is the one who writes the love letters for her!
Parents’ objection to their son following some Sunnahs

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Related Answers:
Obeying parents in shaving one’s beard
Shaving one’s beard for fear of persecution
Printing children’s pictures on clothes
Her mother is in love with her husband’s brother and she is the one who writes the love letters for her!
Parents’ objection to their son following some Sunnahs

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