بسم الله الرحمن الرحيم
(Fatwa: 8/8/SN=10/1435)
First, you should search for a place where you could urinate in sitting position. If you could not get it easily then as per the question mentioned above you may urinate standing in order to save your clothes from urine drops.
Allah knows Best!
Darul Ifta,
Darul Uloom Deoband
