Have stayed at a few hotels with amazingly absorbent , fluffy towels .

Here are some for starters :

Quite a few Amans including Kila , Nusa , Nemu & ..

Then Trisara , Belmond Le Manoir Aux Quat Saisons ( LMAQS ) , etcetera ..
Was it also at FS Bosphorus ?
StR ? somewhere ..

I recall wanting to purchase from some of these but luggage was way too full , even with back up luggage deployed

Will likely recall others after I get over jet lag , my first reply disappeared before I could submit , trying again

Hope this helps