Personally, the idea of a flight suit for a birdy out of the cage 80-90%/day seems like it would be too much --- they would have to live in them. Where do they go when no one is home with them? Do they stay on top of and inside of their cages? Do they go wherever they want (flighted or clipped)?
If you like to have them with you on your bed or sofa, lay a towel or sheet or big t-shirt under you in the areas where the poop always ends up. If they are roaming around on top of the bed, then have an old sheet under them that you only use when they are on the bed. You can use old washable curtains and tablecloths too. If you don't have any, I recommend starting a collection as soon as possible until you have time in your already-full day to figure out something else. Great way to recycle unused stuff (get from family and friends too). Wash them regularly.