💯 agree. IMO only, if your boucle is cool toned black/ navy; verging on day to evening transitional; or high contrast, primarily solid, color block (like pink), these black picks could work nicely. I might wear black pants with black boucle jackets or metallic or fantasy tweed (here with Hermes brushed cotton cargos) or Chanel metallic or dark denim. Or, with Dior tulle or silk/velvet. But these have a dramatic or evening feel
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For a regular boucle jacket for daytime, I would personally pick a more sartorial trouser (personal style preference only). I’m short, and brunello Cuchinelli trousers suit my build and work with my Chanel tweed boucle jackets. Flat finish fabric, medium weight to contrast with the heavier boucles, and of a more substantial weight than silk. Usually classic length, not cropped. Here: tobacco colored twill; cashmere chalk stripe; classic charcoal .
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If I wear a silk pair of pants or techno cargo with boucle for daytime, they also tend to be more sartorial day (but that’s bc the Chanel boucle jackets or tops I pick are usually that type. If I pick a draped Chanel trouser, I find a classic Chanel boucle too elegant (not my style) so I mix up pattern or designer (plaid boucle with Dior houndstooth or leopard Dior with Chanel trouser or metallic Chanel with Dior charcoal leopard)
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ETA: the trousers you picked, for day, could easily pair with a higher fashion, flatter finish top, like Dior houndstooth. Of course, these style choices are very individual so YMMV

It’s fun to experiment