My answer to that is simple - Her proportions lean towards the unpleasant stratosphere of tailoring alao favored by a few of her colleagues, such as Nicolas Ghesquiere, Anthony Vaccarello, The Row and Demna.
I understand the need for more relaxed cuts as a reaction to the shrunk-fitted tailoring of the 2000s and we have seen people like Hedi Slimane gradually loosening up his suiting at Celine, but on the other end of the spectrum there are people like Phoebe who think it‘s a good look to propose a men‘s suit jacket that could be my dad‘s from the early 90ies with a slightly more nipped waist and think that‘s a good look for the average woman - People like Yohji Yamamoto or Christophe Lemaire have done better takes on 'boyfriend tailoring' if we‘re being honest.
For a designer who proposes relatively minimalist clothes like Phoebe Philo, I don‘t think her clothes really nail it as the last word in investment purchases - Which I think echos in the very identity of the brand, which doesn‘t read neither as decidedly timeless luxury, nor fashion-forward.