I am planning on purchasing a vintage lambskin classic flap for my 40th birthday. I can’t decide between the small or medium classic flap. I am worried that the small flap is too dressy for jeans/t-shirt outfits (the medium seems like it can go with casual and dressy attire). On the other hand I am worried that the medium flap is heavier than the small flap. I know lambskin is a much lighter material than caviar, but I know I won’t wear the bag if it’s too heavy. Any input on these concerns? I want a Chanel flap that can go with both dressy and casual outfits and that won’t break my shoulder!!!! Thank you