It's hard to shop for men, especially when buying men's shirts. Men are very specific about what they wear.
Style can be very important for a man. Most guys love clothes and probably have a full wardrobe, but they hate shopping. You may get these clothes exactly as you dressed them or clothed them. You may buy fashionable button up shirt for men via Free 24 7.
You may not know a guy who likes shopping, but you will find that this will change if you have something to talk about later.
Check your husband's wardrobe every time he gets dressed. Having a photo shop can make it easier for you to decide what to buy when you start shopping. You especially want to look at the clothes she wears the most. This will be the outfit you'll get because she obviously likes it if he wears it more than once.
You may even want to look at half of them in your closet and worry about what you like and what you don't. It's like research, but you will do it mentally.
You don't want to buy men's clothes just to be together even if you've been together for a while. Clothes are usually bought by a woman for her husband after they have been married for at least a year or two.
There's no rule against something like your boyfriend, but the two of you may feel uncomfortable. Instead of feeling this way, wait until you are married to get a men's shirt.