This is my favorite fit from you. Basically all that I want in a fit with 3 pieces max. The boots are killer man, you said you weren't sure if they were womens or not right? I cant find even a picture of anything similar. I've also been waiting/looking for some Margiela slim trousers (pretty sure its been done before) with a slight flare for a while, really like that 70's look
I'm all about the flare right now, got some super flared jeans (more than these) and can hippie-wear them with joy. Margiela flared dress pants would be an excellent addition but right now the only ones I can think of have a slight bootcut feel but that is about it. I do have some rather wide, white cotton Margiela pants that are perfect for summer.
Boots are size 41 MMM so probably men's but I got them at the (rare) Margiela sample sale and they might have been prototypes or maybe for some female model with very big feet (not that they bother, brands will make models wear shoes 2 size too small and not give a fuck).