The 8 layers of Swimsuit Fishing RNG:

weather -> time -> fish rng -> hq/nq -> big fish rng -> pass/fail - > desynthesis success/fail -> swimsuit or sand

I am all for working hard to get something, but about a 2 weeks after 2.3 started I've done nothing but fishing (and coil), and so far, I haven't had any luck with the rare swimsuits (not the blue ones). I've been playing MMOs since I was a kid, and I've never seen that many layers of conditions and RNG for a reward.