MommyPoints wonders if paying for a seat for your snow skis would be less expensive than paying for them as checked luggage. This might work for other luggage also, since Spirit often has very low airfare but high fees for checked luggage.
Could you have an emotional-support suitcase??
Bring a second bag containing “an umbrella, camera, infant diaper bag, assistive devices, outer garments (e.g., coats, hats and wraps), reading material and food for the flight.”
A similar idea may work for other airlines that drastically limit carry-ons, like WOW Airlines…review their policies before you fly, and even take a printout with you to the airport.
There is no mention of vests with pockets stuffed with gear, like the ScotteVest.