As you can see, anal is in the game since 0.3.2, and nothing has changed in this area since then, aside from few bugs fixed here and there.
First of all undress her completely when she's laying on her back (face up) and then turn her around to shift legs for doggy position - this will allow you for doggy vag, doggy anal and ass licking interactions.
As for the sweater - yeah there are less interactions, as it would require dev to redraw each animation currently available with the sweater on her - so this is actually intended