I didn't look deeply into Trowa's other clothing in the series since ultimately all of those clothes are issued uniforms worn by many. Still, most of the clothes he winds up wearing are rather flattering on him. Thus, why not showcase them? They may or may not be of his personal preference, but he does look sharp.
★ OZ's Cold Weather Clothing - Interestingly the cold weather coat he wore in Antartica rather complimented his usual look. It was nice to see him in such lighter colors and the green collar combined nicely with his turtleneck.
★ Standard OZ Male Uniform - The uniform is closely modeled after the Russian Infantry uniforms worn during the Napoleonic Wars that took place in 1805-1815. One might as well say the green OZ uniform was made for Trowa. It is one of the best outfits he has worn in the series. The dark green with the crimson and gold adornments really suited him.
★ OZ Astro Suit - It appears to be an MS astro suit for regular OZ soldiers. Possibly for the males only. Given the situation he was in the last time he wore it, it appears fairly form-fitting and well sealed. The color actually was an okay one for Trowa. It might have been better if it had a bit more saturation, but it gives an idea as to what he can really look like in lighter shades. He really should add in some lighter shades of green and blue to his wardrobe.
★ Colony Astro Suit - Yes, yes... it is pretty much a normal astronaut suit by real life standards. The design is retro for the series, very much modeled after space suits of the 60's to 70's. Still, it does show that Trowa still can pull off brighter shades. Really, some brighter colored shirts wouldn't hurt him... as long as they aren't fire engine red, tangerine orange, lemon yellow, pink, or lavender.
★ Gundam Pilot Astro Suit - Worn when all the Gundam Pilots were gathered on Peace Million, it is the best astro suit design in the series. Again, this space suit was made for him... and pretty much the other four Gundam Pilots. The scientists likely designed them. Anyway, the fit shows off his body nicely, the colors compliment and are very masculine. The fact that he has the dark blue combination rather than the dark gray is great as well.