Okay so my H2B has a pretty big family, 1 sister and 2 brothers, and the oldest of his two brothers isn't very much younger than him and both looks and acts like his cloan! Which is fine you know because they're both nice guys and there are enough little differences for me to tell them apart (just about) but because my BIL2B is so much like my H2B I can spot his attempts to flirt a mile off because they're exactly the same as the things H2B said and did before (and for a while after) we first started dating. Now when these techniques were pointed at other women it was vaguely cute that he'd turned out so much like his brother, but lately those little techniques have been aimed at me and I just don't know what to do?!
it's the sort of thing where bringing it up will probably make things worse!

At first I thought he was doing it to wind up H2B but he really doesn't seem to notice and he could be doing it to tease me but it's beginning to get a little awkward as other people overhear and take it the wrong way! Plus what if it is serious? I mean he's got so much else in common with my H2B maybe they also share their taste-in-women?

Don't get me wrong I am NOT one of those women who thinks everyone fancy's her! I hate the way I look (I'm short, pale, and a little over-wait) I'm amazed my H2B is attracted to me let alone anyone else! But BIL2B is definitely flirting!

Like the other day I got in from work and H2B & BIL2B were in the garden they wanted me to come out and I said,
"I'm just gonna change out of my uniform"
"aaaw, I like a girl in uniform" replied BIL2B
"I'm gonna treat that remark with the contempt it deserves" I responded
"as long as it one me a smile" BIL2B said (in a genuine tone)

Or getting ready to go out he'll wander in and say "you look ravishing this evening" and correct me if I'm wrong but 'ravishing' is not really a word you use on anyone other that your partner is it? I mean the definition of ravish is
(copied strait from a dictionary)
Ravish
verb (used with object)
1. to be filled with strong emotion, enchanted, or entranced.
2. to carry off (a woman) by force.
4. to rape or have rough consensual **** (with a woman).
Not a word to throw around lightly!

also H2B sometimes refers to me as "my lovely" which is very sweet and romantic, but BIL2B has started doing it too which just seems wrong I mean it's personal you know? something between H2B and me! plus the 'my' part really doesn't apply if it's not H2B saying it!

these are just a few examples but you get the picture! and it's not a sporadic occurrence either, it's all the time!

Again it could all be a wind up or him trying to be platonicly affectionate via teasing (he does tease his friends and siblings a lot although not in this manner), especially as it's the same thing my H2B says/does but even as a wind up I think it's going a little far!

Plus it's not just the flirting, there have been a number of occasions where H2B has been going somewhere and asked his brother if he wanted to come with, BIL2B has said no but then abruptly changed his mind and decided to come when he found out I was going too! Is it me or is that odd?

anyway I have no idea what to do! as I said earlier it's the sort of thing where bringing it up will only make things worse!
because if it is a joke or something saying anything will only make me look like one of those self-centered girls who think everyone's in love with them, as well as embarrassing us both and making him uncomfortable around me because he'll worry from then on how I'll take whatever he says, but if it's genuine then firstly he might not even realize he's doing it (or he does but doesn't realize I've noticed) and it'll lead to a very awkward conversation and still embarrass us both!

all in all I'm kinda thinking my best option is to do nothing, pretend I don't notice, but I needed to get my concerns off my chest somehow! (hence the rant) I don't know, what do you think?

I think you're reading a bit too deep into the ravishing thing, he was probably just trying to use a fancy word lol. But if it bothers you you should bring it up with your H2B, he'll probably know better than you what his brother is like and maybe you could get h2b to have a word with him?

To me it sounds like light hearted banter between friends. If it bothers you though you should raise it with him. Just sit him down and say I understand you're only being friendly but can you not call me my lovely as that is a special thing between me and H2B etc. but as I said I don't think there's anything untoward going n.

i wouldnt say anything either unless you actually have feelings for him in that way as that could get pretty awkward. my bil does it to me, hes the same hes so much like my oh there is only a year between them, hes always flirting but i take it with a pinch of salt, i dont like him in that way i love my oh with all my heart, i love my bil as a brother in law he is just like another brother to me. if it really bothers you then just ignore him he will soon stop when he realises its not getting him any attention x

I think you may be reading too much into this situation. But if you don't like the banter you can always ask him to tone it down a bit. Or just ignore him. That's what I would do anyways...

Can't you throw him some sarky comment back e.g when he says 'my lovely' reply with something like 'i'm only (other half's name) lovely' or something like that!