I got quite a good collection, always finding a way to buy more stuff.

Mask-wise, I tend to prefer those from Dreammask, as they fit very well. MoliFX has turned to be my second choice - their Luxuria mask looks amazing. I've also purchased from Roanyer and from others, and my first mask was a CreaFX but it's too damaged to be reused.

As for other prosthetics, I tend to purchase breastplates, girdles and gloves. I've gotten them from multiple sizes, though ever increasing.

Breastplates: I find the ones I use the most are those from Dokier, followed by MoliFX. Dokier sells good, long-lasting breastplates at a relatively cheap price, though sometimes they can make them pretty thick.

Girdles: Since I like big curves, The Kim has solved many of those problems. I got a couple others from Dokier, EYung and Roanyer; the latter is more of a panty, with thin and stretchy silicone, but the genital opening is very wide. I usually have issues with those little tubes, which is why I like when they're wide and stubby, I will say that I think I got more EYung girdles than anything else.

Gloves: I started with ones from Celesmask, which I still have, and moved to test a few others. Gloves are the least exciting because they're hard to put in, hard to take out, and prone to tearing. The ones I got from Dreammask fit snugly and nicely but got a nasty tear after a couple uses, mostly because their nails are glued on properly and I was trying to avoid breaking them.

As to where I buy everything - AliExpress, though the MoliFX stuff I buy directly from their site. You can find them cheaper while still being the real deal.

And as a final remark: I have that Hathaway mask in OP's pic. Hathaway is one of my favorites, though my favorite mask still has to be the Haena.