This was a thoroughly enjoyable story and if you want to end it here then I for one have no complaints.
If you DO decide to continue it and humiliate the sisters and their mother more publicly, then I would suggest that it would be even better to strip them in front of their own snobby circle - none of whom particularly care about anyone other than themselves and many of whom might be completely ready to see Mrs Tomkins in particular, as well as her daughters, utterly humiliated. This may just be my own personal tastes talking but personally I'd also like it if Mrs Tomkins' body wasn't nearly as good out of its clothes as it looks in them (I'm a big fan of bra stuffing ENF myself
).
In any case, I look forward to more stories from you in the future.