i have not, but so far i haven't personally asked here on tbt for any help (though i have traded items, if that counts). i'll probably end up asking for help though eventually
i'd be very impressed with anyone who does manage to do it! i'm sure there are, since some people just buy everything in the store from the start of their game.
Most of the items from the clothing and department store were collected on my own.
I only needed to catalog the birthday song and a dress that never appeared.
Yeah, a lot of those items are gonna be hard or impossible to get alone. The 2017 Cake as well as other DLCs and region-exclusive items aren't going to be obtainable without hacking.