I got a bag that can carry a helmet, clothes and boots plus an area for accessories for Dover Saddlery and you can get them monogrammed, too! The link is https://www.doversaddlery.com/dovers-gear-bag/p/X1-33258/
well the best way to get anything monogrammed is to order the item you want monogrammed online. the fastest (personally for me) is smartpak, their headquarters are in massachussetts and i luckily live in the northeast as well so they ship quick (sometimes next day!). dover has more options for monogram style though!!
if you already purchased an item, i'd reccomend going to either a dover saddlery store or a beval saddlery store, though both are less reliable and will take more time (personal experience).