KT Tape! I used to wear a knee brace all the time (3 surgeries on 1 knee). I started using KT Tape for my dancer who needed support but did not want a brace showing. Our next trip to WDW, I taped up my knee (very easy to follow videos; just google KT Tape full knee support) and stuck my brace in my husband's back pack just in case. The rest of the trip, the brace stayed in the room!
I can usually get thru a week long trip with 2 tape jobs: 1 at the beginning of the week and 1 half way thru. You can swim, shower, sleep etc with the tape on. Just remember to pat dry rather than rub. I do have to trim the ends each morning, but I have so much more freedom without suffocating my leg in a brace in the heat of Florida! I do recommend that when it comes to taking off the tape that you do it in the shower/tub.
Our last trip was barely a year after I had broken my ankle, so I had my right knee and left ankle taped, and I was fine overall!