I usually find backpacks very useful for weight distribution and use a shell pouch like for skeet for shells. If hunter orange is req'd , just use an old Hunter Safety vest on the pack.
I forgot about briars, glad you brought it up, good idea! I see we are one state away ( TN, AR) so if your weather is a unpredictable as ours, I'd dress in layers...walking keeps you warm, if you stop, put something back on. I've gotten to where smooth sole boots like LL Bean rubber bottom/leather tops are great. My Danners are 25 yearsold and tho nice, those lug soles really get heavy with mud.
I use to hunt swamp rabbits, but dang, them hip boots get tiring fast...and I'm not getting any younger. We let the whippersnappers do all that stuff, we old farts let them flush and we stay dry and shoot. Shush...don't tell the young'uns...they will either wise up, or get older and the "smarts" will kick in.
That 1100 will work fine, but if you have an O/U that would be fun, you didn't mention gauge, fixed or screw in chokes. I'd still go I/C and Mod for chokes on a double.
I use a camo fleece for quiet and all out and about for some stuff, main use is day pack. For rabbits, squirrels...concerned blood, fur, feathers, I wait til after school starts and they mark down the school backpacks. Gray, brown, OD green works well. My last one cost a whole $8, had padded straps, and a nice outside pocket and "beverage holder"...thermos toted right nice in there. That mat hanging device at the car wash is what you use to clean a backpack btw ...I know...some folks think it is actually for vehicle mats, they are really designed for cleaing hunting gear. Little known secret.
Oh...If one is a running -whistle- sometimes they stop and turn ( they can't believe it I guess). since I can't whistle like my buds...I yell...hey whatever works.
Sometimes it gets too comical to shoot, I just have watch the critters. I have fun, enjoy being out with good folks.
Post pics and any good recipes if will please. Gotta have homemade scratch biscuits with wabbit...it's a law, I just know it is...somewhere -gotta be.