Don't reload the page after
- an item has been removed from the wishlist
- a size has been selected
- an item has been added to the basket
- viewing an item in the wishlist

Reloading the page after all these actions makes clearing out the wishlist very time-consuming and is not UX friendly. I'd probably add more items to the basket from the wishlist if the UX was easier.

When setting a category filter and viewing an item in that category, it also refreshes the page when going back, removing the category filter and loading all items in the wishlist instead.

A filter to add your sizes would also be helpful and for the wishlist to indicate if items were no longer available in that size; customers could then select to remove these items or to be notified when a size becomes available again.

A sorting filter 'Items last added' would also be useful; if I add a whole bunch of items to my wishlist today, I have no way of filtering by these items, instead they are somewhere in between items added months ago that are no longer relevant, but haven't been removed from wishlist due to bad UX explained above.

Make clearout my wishlist (and add items to basket) more interactive; show me an item in my wishlist; swipe right to Keep, swipe left to remove.