I bought these BB cotton/linen pants; the color is nice, but it might pose some difficulties as to what kind/color of sportcoat and shirt can be worn with them. Any suggestions?

Thanks; actually, the navy blazer was the first thing that came to my mind, but it's always useful to ask for suggestions here...And I may get some who disagree with me, but a navy blazer too. The shades of blue are different enough to let you get away with it.
As for a shirt, I'd keep it simple and stay with white.
Yes, I was thinking to go with brighter colours, as the summer is getting close. Do you think an aloha shirt would go with them in a more casual (and hotter) variant?Are you looking to pair these trousers with other bright spring/summer colors, or subdued colors?
I think that a gray/white, tan/white, or white/white would look better. As for the shirt, since these are solid I think you can go lots of different directions and patterns. A white with blue pinstripes, a pink, peach, or maybe even lavender gingham would also work. Thinking about it further, I would say that lime green could possibly work as well. That might come off as a little easter eggish though.Also, would a classic blue/white seersucker jacket go with these?
I think a navy blazer could look great, if worn with the proper accompaniments. I'd keep the shoes more casual. White bucks would work well, tan would be good too. Lighter colored footwear would likely tend to pair better. Tan loafers, etc. Nothing wrong with a plain white BD if you want a tie, but make it a lighter, more relaxed summer tie. For sport shirts, keep then simple in lighter, harmonizing colors and it should look for very good, if you're wearing them with the navy blazer.Thanks; actually, the navy blazer was the first thing that came to my mind, but it's always useful to ask for suggestions here...
Sorry, not something I think I'd care for.Also, would a classic blue/white seersucker jacket go with these?
Sure, and sure!Yes, I was thinking to go with brighter colours, as the summer is getting close. Do you think an aloha shirt would go with them in a more casual (and hotter) variant?
And in a less casual occasions, I would wear them with more subdued colours of shirt plus a sportcoat...
Yes. IMO, pairing some pastels can look Easter eggish.... pink, peach, or maybe even lavender gingham would also work. Thinking about it further, I would say that lime green could possibly work as well. That might come off as a little easter eggish though.
+1 for a simple and classic "aloha" shirt.If you wore an aloha shirt, I keep it simple and classic