1.

Loose Underbust: 37.5"

Snug Underbust: 36"

Tight Underbust: 35"

Standing Bust: 42"

Leaning Bust: 45"

Lying Bust: 43.25"

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1. Most of my bras are more than 5 yrs old, I mostly wear the same two, I would have thought they were 36C, but tag is not readable, on these I have issues with straps falling down. I have two "t-shirt" bras that are 38B, my boobs seem to poof out the sides, I feel like I may fall out of them, but look to fit fine.

2. I'm new to this so will try my best.

Average projection

After reading links and looking at pictures, I'd say full on the bottom, but spreads to the sides.

I think the root is narrow and short.

1. I quickly lost 40lbs and over the last 16 months gained all of it back (I can blame covid for 10lb). It didn't come back where I lost it, lots came to my boobs, and I am working to lose it again (for good), so realistically my bra size will change again, and some of these may be easier to figure out.
   

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There is a local shop that does amazing fitting, I bought the bra for my wedding dress there, and they gave me a size I had no idea I was (kind of like they size guide). But they are mucho expensive and I don't want to dish out a fortune for an amazing I had a boob job bra, if its only going to fit me for a year.

Any help is appreciated.