One thing about using the toilet is that it is preliminary to becoming independent of mommy and daddy and nanny etc being "in charge" of a individual's becoming aware of the need to use the toilet , the ability to get there and remove the necessary clothing and ending up clean and dry after using it. This is so much easier in summer with panties and shorts with fairly loose elastic.
In winter you want to encourage the same amount of self control and sufficiency, but you do not want it to result in wet or dirty clothes that have to be changed just as if it were a diaper change. You also do not want the child so loosely and lightly dressed so that she is cold all day whether or not she is wet.
I like velour and corduroy and knits that are sort of clingy and move easily and usually give good coverage while allowing easy removal.
Panties under dresses are easiest to remove, easier than tights, but pants that have elastic that isnt too tight work pretty well and are very warm.
Encourage her to feel proud of her new found independence. try to avoid snaps and buttons etc she can't handle in a timely manner.
Have fun with this stage. They do grow up all too fast, don't they?
Blessings, N.