Yes… You likely had fairly flat and atrophied feet. I’m guessing they were pretty long and narrow, with your big toe extending much further than your little toe. With a more developed arch, foot muscles in general, and not being bound, your foot is probably quite a bit wider with a more square toe box. That square toe box results from your big toe being pulled in.

Also, if you had an issue with water retention before, your feet may just be less swollen now.

40kg is about 88 lbs, and could be a significant enough amount of weight to lose for these changes.