Read English Alf's "list" at the top of the forum. It has a consolidation of all of our suggestions.
I got a pair of cheap Old Navy fleece pants, and cut the seam at the knee long enough to push the folded-up "big/night" bag through.
I never used the leg bag. My nurses convinced me it was safer to not disconnect/reconnect bags for the 7 days I would have the cath.
Take as little as possible to the hospital -
- leave wallet & credit cards, wedding ring, etc. at home. Bring your ID, insurance card, and whatever they need for deductible/co-pay. Have whoever accompanies you be responsible for house keys
- I used an adjustable depends-type pant as underwear - I had really bad bladder spasms, so leaked all over the place from the start.
- a doughnut, 'roids cushion will help for the ride home.
- for in hospital, I took a light bathrobe, my cell phone, and a book.