I'm faced with the same problem. I don't know where you're located, exactly, but in the US Old Navy and even the Gap have taller sizes and slimmer fits. Old Navy is lower quality/cheaper. You can find 36-inch inseams on a good selection of their pants, some with 32 inch waists, which is pretty tall and slim. The 1MX shirts at Express also come in tall/slim.
As for the fits, I've noticed something about that. It's a great idea to go into stores and try on the different fits, even if the lengths don't fit you exactly. Today I found that many stores in the US do have 36 inch inseams, but they are online exclusives. So you can try on the different fits and waist sizes and see what looks/feels best while ignoring the shortness in the leg, and then ordering the exact same pant with the longer leg online. I did that today and found that a 32-waist loose fit looks and feels better than a 32-waist slim fit, due to my quads...the slim fit felt and looked like a skinny around my thighs! Or I could have used a 33-waist slim, but that was a little looser around my waist. The 32-waist with the loose fit still looks like a slim fit, though, because of how tall I am.
Bottom line, you're cursed with having to go to many stores and try many things on, finding out that most don't fit. Take my advice and don't compromise and buy something ill-fitting, though. Like you said, it just looks bad, and it's the fastest way to make a $150 shirt look like a $30 shirt.
Oh, and if you happen to find a store that does sell tall/slim clothes, I'd love to hear about it! I'm always looking for new options, especially in Europe and the US.
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