In Deep River there’s one of the best thrift stores you will ever find. It’s called PRP - Pandemonium Rainforest Project. It is both a thrift store and exotic animal sanctuary. 100% of their proceeds go to saving exotic animals. They get everything in donation, and they even have a cafe in there to get more money. The entire upper floor is mostly clothing (there’s some decor and a kids area), and the downstairs is everything else. My wife and I have spent a lot of money in there and have also donated a ton of stuff. I know it’s a little outside your general area, but it’s right off of exit 5 on Rte 9. You can see it from the highway.

In Old Saybrook, there’s The Cedar Chest. They have a store with tons of clothes, and next door is furniture.

Right around the corner from Cedar Chest is The Estuary. I’ve never been in because they have weird hours, but it also looks like mostly clothes.

I know they’re outside your area but you could make a trip out of it and go to all 3 since they’re close to each other.