G-STAR Men's 3301 Slim Jeans

I’m usually 31 waist but how does the 30 waist feel,are they a good fit or tight?

I'm stright fit 30s when it comes to jeans. is 30w & 30l is the same as 30s?

I'm a 36 inch waist in other brand named jeans so should I stick with a 36 inch waist for these jeans or go a size up , ,

Any size waist 36/32.or 36/34 in this!?